Last time when (Y/N) and the others return home of their world

When Izuku Midoriya is training with All Might in order to learn and inheritors of One for All.

And (Y/N) had no choice to transformed in front of his friend in order to save the little girl from the worm attempted to killed her.

And Dark Decade the Leader of the Dark Riders going to travel to another world what is he planning?

And They all arrived in the world of Kuuga, what will happened?

On the top of the tower, where Jessica is waiting for someone to meet her here in the world of Kuuga.

???: Been long time Jessica.

She glances to someone she know well back in the organization.

Jessica kept her neutral face staring at her friend.

Jessica: Rena, we need to talk.

(Play Journey through the Decade by Gackt)

(Kamen rider Decade, he has been given the power of a destroyer. And what will he do to see if he travelled through all the world to save them?) As the song started focus on Decade, who just already transformation, standing here in a white room filled the cubes and face the camera.

(Miageru hoshi sorezore no rekishi ga kagayaite) Rachel covered (Y/N)'s eyes  until she let's go. His eyes zoomed in and is soon replaced by the camera, his camera, and later his Neo Decadriver which includes the 19 including himself. His Machine Decader is shown in parked of front a pile of smoking rubble where (Y/N) sitting alone before, in the white. (Y/N) grabs one of the cubes and looked at the camera.

(Seiza no you sen de musubu shunken hajimaru legend) The scenes changes to shown the worn down warehouse with all the riders sitting out of one of time. Rachel grabbed the bottle and (Y/N) looked back. Ryuji slumps back his TryChaser200 with Boku no Hero Academia's characters and Toaru Majutsu no Index are here standing or sitting down. As the silhouttes of the riders appeared one by one. Rachel throws the same bottle down on the floor.

(Oorora {aurora} yurameku jinkuu koete. Tobimoku meisou suru Parallel world) On the side of the dark riders charge while the other of the Riders of Good did the same. The same bottle shatters as (Y/N) look as through he was about to collapse but not before his face changing into each of the Rider's helmets. Backed to the warehouse all 19 riders line up doing their signature poses and with Decade in the centre and behind him was Rachel.

(On the road dare no tobi no tonchu. Hontou no jibun jishin deau tame.) All of the 19 riders were in circle and fending off the dark riders as they surrounded by them. (Y/N) is shown on his bike getting his helmet on and Rachel was riding passenger. Rachel hold on tightly around his waist before we see Decade showing off his fighting skills especially with the Attack Ride: Slash card. And soon back to the Rider, everyone doing their best trying to watch each other's back while against Dark Riders.

(Atarashii yoake e to tsuzuku michi ni kawaru no darou) (Y/N) sits alone exhausted tearing coming out of his eyes down to his face. Until Rachel was in front of him with his camera and offering the other to help him up. We soon Ryuji ride along with (Y/N) and Rachel on their respective bikes. Back on the battle Blade was having trouble with Glaive until Decade shows up and pushed Glaive away. Ryuga was about to use his Strike Vent on Decade until Ryuki uses his first to save Decade.

(Mokugekise yo Journey through the Decade.) The riders are helping each other trying to take down their respective foe. Soon Rachel smile in Decade's mind. But Decade focuses on the battle and helping his comrade's. Decade was soon driving on his bike driving out of the Dimensional Wall with pictures of the other 18 riders in it circled the logo.

(Opening ended)

At Jessica and Rena looking at the mountain staring at it.

Rena: So this is the world of Kuuga. Chuckles I heard about him, such a legend of the first Heisei rider.

She smile awe talking about Kuuga.

Jessica: Yeah.

She nodded her head.

Jessica: That's why I needed to talk to you.

Rena: Hmm?

She turns to her caught her interests 

At the Studios/shop.

Everything went normal expects that....

Izuku: WE'RE IN THE OTHER WORLD?!?!?!?!

Expects form Izuku was screaming in shocked seeing that they're in other worlds, making them covered their ears.

Before Rachel removed her fingers away from his ears.

Rachel: Well, yes, this is the different world that we're not in our worlds.

George: Rachel! Izuku! Comes looked at the TV!

He shouted at them, they all coming to the TV turning on the news showing the police forces are lining with the shield, and there are Grongi attacking.

TV Newsreader: Does it understand the whole police force is after it?

Rachel: What is that?

She wondered about the monster.

Izuku: It's looked familar.

Geogre: What could it be?

He sat down on the chair.

Until (Y/N) popped out through the door wearing his police uniforms and the hat hiding on his eyes.

(Y/N): I had a report received from it. That a villain has hiding there. You're under arrest.

Izuku: Ehhh?!

He shouted in shocked seeing his friend grabbing his adoptive sister tightly. But she managed to turn him around in defense technique.

Rachel: Laughter Pressure Point!

She uses her thumbs to poked on his neck.

He burst out of the laughing, held it here the neck has been poked before placing on George's shoulder and laughing together.

Rachel: This is no time for playing, (Y/N)!

She grabbed the hat with the disappointment on her voice.

(Y/N): Bindly pressing pressure points is a crime. Rachel I'm going to peel you!

He lets go of George's shoulder before getting his police hat and continue laughing.

Rachel looking at the newspaper seeing what she saw.

Rachel: Looked at this!

Gotten her brother and friend's attention, (Y/N) grabbed the newspaper saying "Unidentified  Lifeforms". Of the monsters

(Y/N): Unidentified lifeform...?

Izuku: What does even mean?

They reading the newspaper.

Rachel: A scholar believes they are called Grongi.

(Y/N): So in this world, Unidentified lifeforms appear.. fighting police?

He lets go of the newspaper, curious looks on his face. before realize in something coming to somewhere in this room.

Rachel: (Y/N) where you going?

(Y/N): Look at this.

They all going where (Y/N) is, showing the newspaper of Kuuga on the newspaper to them.

(Y/N): Undidentified Lifeform 4. Aka Kamen rider Kuuga in this wor....

Izuku: Kuuga!

Izuku suddenly cuts (Y/N) from talking is in excitement/joys his eyes becomes light up and sparkles again.

Izuku: You mean the First Heisei Rider in the years of the 2000 fought the Grongi monsters, alongside with the humanity and police and his goals to protects everyone else smiles from the monsters?!

Made his friend smile a bit seeing his friends acknowledge the first Kamen rider Heisei.

(Y/N): Yeah that's the one.

Rachel: In order to save the worlds from the hands of the Dark Riders and Kaijin to taking over the worlds or destroyed the worlds if they refuses to serve them. We have to travelled all the worlds. So what we're supposed to do?

She wonders about this.

Izuku: But why we here?

He questioned his friend.

(Y/N) proceeds telling his friend about they had go to travelled to different worlds because they had to stop Dark Decade and his dark riders to stop them from taking all over the world or destroyed the world. They won't leave if they accomplished their missions.

Izuku: I see. 

He place his thumb and index finger under his chin.

Izuku: And why is (Y/N) is wearing this like this?

He pointing in confusion he's wearing the police uniform.

He glances made him smirked.

(Y/N): Good question my friend, its seem like the world has given the role in this world by like in our last world visit. 

He showing his badges police.

(Y/N): Policeman (Y/N) (L/N). We'll be working along partner.

Izuku: Eh...

He glances in down. He surprised his school uniforms changes into police uniform like (Y/N) expects for Rachel didn't changes.

Izuku: Eh?! Ho....

(Y/N) placed a finger on his friend's mouth.

(Y/N): Hush, my friend there something to do, we're in this world. We're policemen... so that's mean we had to fight the Grongi. Let's go partner!

He grabbed Izuku's wrist rushing away while he scream in panic. Leaving Rachel alone.

Rachel: It is really a simple?

With a concerned look.

At outside of the house, (Y/N) and Izuku are getting on their bike (bicycle) after left off going to finding Kuuga in this world.

There is a young girl rushing to the warehouse, where Kuuga fighting is. Her name is Ana.

At Kuuga, he throwing one of the grongi on the ground while the other one round kick at the chest but Kuuga blocked it. The other one gots up on the ground, tried to punch it but Kuuga punched it first.

While Ana is watching the fight.

Kuuga tried to punch but they dodge it, they punch it together, they punches same at the time but Kuuga dodge down under beneath before getting up looking at his opponent.

Ana: You're not match for your opponent! Move faster!

She shouted at him.

Kuuga: I know!

(Y/N) and Izuku arrived at the warehouse where Kuuga is currently fighting the monsters.

Kuuga: Chou henshin!

His color changes into blue.

This Dragon form of Kuuga.

(Y/N) taking the picture on his camera likes he always do and Izuku anaylsing of Kamen rider Kuuga to see what can he do or fights.

Izuku: Kamen rider Kuuga.

At Kuuga throwing the grongi at the other other grongi before looking at the pipes.

Izuku: He uses to form changes to match the battle.

He grabbed the pipes before transform the pipes into the weapon of staff.

Izuku: He can change objects around him into weapons.

Izuku is smiling at Kuuga while (Y/N) taking the pictures on his camera.

Izuku: He's a very well made.

(Y/N) glances at his friend and smiling.

(Y/N): Man you got more knowledge then me, Midoriya.

Izuku: Y-Yeah, that's my hobby.

He embarrassly rubbing his head at the back.

(Y/N) return to his camera taking the show before someone called him out.

Ana: Hey you two! Is that personal property?

They all turns to Ana looking at them she farrows her eyes at them.

Ana:What are you doing?! Didn't I tell you to retreat?!

Before Izuku could talks but (Y/N) cuts him from talking.

(Y/N): Right. Right. Just one photo.

She looked at him, growed at bit annoyed.

As Kuuga hitting them with their staffs, the two grongis tried to attack Kuuga but he's keeps hitting them with his staff.

He spins his staff and stabbed the Grongi at the back send him flying and landed on the ground to rolling.

Suddenly there a symbol on the back of the grongi causing him exploded.

The bird grongi rolling on the ground before regains to get up glaring at the Kuuga. Before using the wing to fly.

Kuuga tried to strike the grongi but it dodge flying up to the air.

Ana: Ryuji here! Use this!

She grabbed her gun before throw at Kuuga.

Kuuga: Got it, Ane san!

He nodded his head.

Making Izuku and (Y/N) confuse a bit by Kuuga calling her Ane-san

(Y/N) and Izuku: 'Ane san?'

Kuuga: Chou henshin!

His colors changes again instead of red it's green.

This is Pegasus form of Kuuga.

He catches the gun before transforming into Bowgun like gun, before jump in the air where the Grongi is flying.

Izuku and (Y/N) looking up at Kuuga is until Ane steps in front of them.

Ane: You better not starts any rumors.

At Kuuga, he landed on the rooftop before looking at the sky.

He pulling the hammer in fullest length before letting go of the hammer creates an energy arrows aiming at Grongi.

At Ana she opens the door arrived where Kuuga is, looking at the sky where Kuuga shots an arrow directly to destroyed the bird grongi causing it to be exploded.

She rushes at where Kuuga standing before reverting into back of his human form and the belt known as Arcle disappeared on his waist.

He smiling and twirling Ana's handgun.

Ryuji: Thanks, as always!

He offering back of her handgun.

She take her gun back from Ryuji's hand, putted on her coat looking if the polices or everyone are here.

She the only one knows Ryuji's identify of Kuuga don't know about his transformation but they had to learn his transformation.

Ana: Someone died. Show respect.

Ryuji: Right, right.

He kept smiling with his cheerful attitudes and salutes at her.

Ryuji: So what you think of my "chou henshin" today?

She turns away from him, while crossing her arms.

Ana: Not bad today. You defeated Number 8 and Number 7.

She small smiles before Ryuji smile at her.

Ryuji: Then how about taking me out to eat, Ane san.

He pleading with his hands together praying bow a little.

She turns to him,

Ana: Ryuji, you should rest.

He voice hinted with worried.

His disappeared before turning away from him.

An: There's still more that we don't know about your transformation.

Leaving him alone.

But they were unaware by they were being watch. By Rena was watching them.

She wasn't here to spy on them but she only here for (Y/N) thinking it he's evil or not.

Flashback

Rena: Haaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah?!

She sounded so surprisedly.

Rena: You want me to spy on Decade?

Jessica: That's right.

She nodded kept her neutral face before turning her directly to Rena's eyes.

Rena: But why do I had to watch on Decade?

She started to whinning and pouted her cheeks almost like childishly.

Jessica: Because, my brother fought him.

Causing Rena pft out, trying to hold on her laughter because she wanted to laugh it out to see it is funny.

Rena: D-Drake g-got defeated by Decade?

Trying to hold her laughing.

Jesssica: Indeed, but yes.

She nodded.

And Rena burst out of  laughing from her mouth uncontrollable while Jessica kept her neutral face on not taking any smile on her face.

She pant and smile looking at her friend before stopped laughing.

Rena: So where is he?

She grinning for interesting.

Flashback ended

While Rena is spying on (Y/N) with his friend Izuku Midoriya are riding on their bicycle while Izuku talking about how Kuuga is cool fighting.

Rena: So this is Decade. But he actually pretty cute.

Meanwhile in the cave

There is a man wearing a hooded cloak noticed the small cave. He smirked under his hood He walks into it and sees Gamino and the other grongi amongst themselves. Gamino noticed first.

Gamino: Gufnalff burgefhao, human?

While the stranger staring at the leader.

Hooded man: Human helopf... Grongi heulad Gamino.

This caught off guard on Gamino and the other grongis.

Gamino: So you could speak our language, human. You deserve some more recongition for it but only a little.

While the grongi stare at him.

Hooded man: I could do so much more than that, Gamino.

Gamino: Can you?

Before he facing to Gooma and Doruda.

Gamino: Gooma, Daruda, kifuda morkal.

They at the stranger but he dodge Gooma's charge and while kick Doruda.

Hooded man: Gamino, hikori makfuki,

Some mysterious man taking the driver similar driver to Decade but it's different, has black and purple dot.

He place it on his waist, formed along with a ride Ride Booker.

Gamino: Interesting, who are you, human?

The stranger taking out the card, revealing the card is Dark Decade meaning he's Kamen rider Dark Decade.

Dark Decade: I'm just passing through Kamen rider. Oboeteoke.

Dark Decade: Henshin!

He place the card in the driver. The driver sounds like Decade's but it is deeper and sinister.

Kamen ride:

He closes his driver until the Dark Rider's leader's symbol appears on driver.

Dark Decade!

He transformed into Kamen Rider Dark Decade.

Gamino looked at interest in this.

Gamino: Gooma, doruda, tesifku rider.

Gamino them and they nodded. Before charging again, Dark Decade turns his ride booker into sword mode, starting to slashing them. Gooma and Doruda were intensely overpowered.

He takes out a new card from his rider booker.

Dark Decade: Gamino, Kuuga wilkoshite mavo.

Placing the card insert the driver before closing it.

Kamen ride: Kuuga

Dark Decade transformed into Kuuga but his eyes are black instead of red.

While Gamino looked interest at DD-Kuuga while the other grongi growled at him.

Gooma growled attempted to strike at DD-Kuuga but he managed to flip to over and punch his stomach. Gooma growled in pain, it was more intense than real Kuuga.

Doruda charged next until DD-Kuuga kicked him and start beating in the face. Gooma attempted to help his comrade but he kicked him away. Soon DD-Kuuga charged at Gooma by punching in the face. 

Soon DD-Kuuga place the card in his driver.

Kamen Ride: K-K-Kuuga!

DD-Kuuga's foot burst in flames. He jumped up in the air do the side kick position.

Hit Gooma and soon exploded, Doruda soon but he was about to charge to avenge his comrade.

Gamino: Enough!

Soon Doruda stand down. Gamino who faced DD-Kuuga before revertted back into his base form rider.

Gamino: You've grabbed my attention, human.

Dark Decade: It's Dark Decade, and if you're willing to listen then Kuuga and an adversary of mine dealt with.

Gamino: Very well, Dark Decade we'll see of how alliance works. What do you have in mine?

At Police station

(Y/N) and Izuku are heading to the meeting where all the offices policemen or policewomen are meeting in the rooms.

Izuku: Whoa! This is police station.

He staring awe of the different rooms wandering around the stations.

(Y/N): Yeah this police staion but.....

He takes out Kuuga's card but it's grey believed it's sealed.

(Y/N): This world have locked on Kuuga's card unable to transformed.

Izuku: Really?!

He snatched the card out from (Y/N)'s hand examining the card for a bit.

Izuku: You're right but maybe the lock needs to unlock it.

(Y/N): Yeah properly.

He nodded his head.

Suddenly they heard an announce on the police announcing it.

Annouce police: Urgent announcement!

They all listen wells to their attentions on the announcement.

Annouce police: Just now a different Unidentified Lifeform attack a patrol  car. To repeat has attacked a patrol car.

(Y/N) turns to directly to facing his friend. And heard a beeping sound, he quick glances and raised his arm.

Coming from his Wristband device alerted there an monsters attacks.

Izuku: Oh no, they attacked by Grongi!

He shouted in worried in half low.

(Y/N): Okay, you go back to Studio, I'm going to help Kuuga to trust me.

Izuku: Got it!

He shooks his head nodded before they departed.

Police woman looking horrified seeing the Grongi killing her partner, the grongi looked at her spares her life.

Before running away. Leaving the police woman alone rushing away going to the tunnel suddenly Kuuga appears punching the Grongi unidentified 9.

Kuuga: Wait! Why you killed the police officers.

Grongi speaking their language seems like he cursing to Kuuga.

Kuuga: Answer me dammit!

The grongi headbutted on Kuuga, kicking him on the abdomen laying on the ground creates the spear looks like he's going to stab Kuuga.

Until suddenly Decade come in and slashed at Grongi with his sword, while the Grongi flew up and Kuuga seeing surprised there another rider like him.

Snapping out of his thought seeing Decade lends his hand offering to help him get up.

Decade: Here.

Kuuga accepts and grabbed Decade's hand to get up back on the ground.

Kuuga: Who are you?

Decade: A friend, that's all you had to know for now but I promise to answer your questions later.

Kuuga nodded his head in understanding, the two seeing the grongi is getting up.

Grongi: Beashfoa Helaif?

But no one understands him.

Kuuga do his henshin poses.

Kuuga: Chou henshin!

He transformed into Dragon Form.

The two riders were fighting against the grongi. Their weapons locked in the two riders soon kicked the grongi and Decade take out his card, place it in his driver and close it.

Attack Ride: Slash!

His sword covered by pink energy along with ponk silhouettes. He slashed at Grongi he moan in pain.

And Decade take out new card place it in his driver.

Final Attack Ride: D-D-Decade!

Ten holographic card sized human appears in front off Decade leading to the Grongi. He then jump in the air then stright kick leading to the Grongi through the cards and destroyed the grongi.

He landed on his feet as Kuuga ran to Decade.

Kuuga: Thanks for the help uhh...

Decade: Decade. Kamen rider Decade.

Kuuga: Thanks, Decade.

Decade: Don't worry about it, us riders alongside to stick together and help each other.

Before he walked away.

Kuuga: Hey! Where you going? You should answer my question?

Decade: Sorry, I want talk to you but not now. Trust me but we'll meets again later for now on and hopefully I'll answer your questions by then. See you around Kuuga.

He gets on his bike before started on to drive away, leaving Kuuga revertted back into his citizen form staring awe to Decade.

Until Ana rushes to Ryuji stands next to him wanders who is the other rider like Ryuji.

Ana: Who is this guy?

Ryuji: I don't know but, I get the feeling he's on our side.

He crossing his arms staring at Decade lefts.

At Studio, after Izuku returns to the studios. Rachel in the office counting, she stretching her arms in tiredness waiting for her brother to returns home.

And return to rest her head on the table.

Rachel: I wonder if (Y/N) forgets his mission.

Until someone opened the door.

Rachel: (Y/N)?!

She glances at it is her brother, but no it's not.

It's Ryuji looking around thinking it's a cafe or restaurant.

Ryuji: Huh? Wasn't this cafe?

He asking her.

Ana: It's obviously not!

Rachel: Right. This is the studio photos shop.

Ryuji: Oh! Sorry about that.

Before Ryuji attempt to leave the house but George popped out his head with holding a cup.

George: Ah! I have a cup!

They all glances at the old man, smiling.

Geogre: Come in!

Rachel: Then... if you...like... come in.

While Rachel and George are making a coffee for them while Ryuji and Ana are discussing about the mysterious armour man.

Ana: Who you thinki it is?

Ryuji: His name is Decade I think our aura are similar and different then Grongi, I think we're being allies.

He sitting down the chair.

Ana: Well, that is true that your powers is similar to you and different then Grongi but I thinks you guys are protecting the humanities.

Ryuji: Well, that's true but I think we should look and talk for him.

Ana: Yeah, I should investigating where the other rider likes you.

???: Well you properly seeing him here.

They flinches turning to look at the young man wearing a police uniform is looked familar hiding his face

It's (Y/N) wearing his police removing his hat, he smiling at them.

Ana recognizes him.

Ana: You!

Making Ryuji confuse for a bit.

(Y/N): Nice to see you again.... Kuuga.

Making Ana and Ryuji widened open in surprised that (Y/N) knows his identify.

Ryuji: How you know that I'm Kuuga?!

(Y/N) take out his card to show Ryuji and Ana made them surprised and recognizes the card.

Ryuji and Ana: You're Decade?!

Made (Y/N) nodded.

(Y/N): Yeah, my name is (Y/N) (L/N).

Rachel: I'm Rachel Watanbe and this is my grandfather George.

She brings the two cups of coffee places on the table.

Izuku: (Y/N) you're here?!

He came out of the door popped out to see his childhood friend before spotted Ryuji and Ana, she recognize him.

Rachel: You!

Izuku started to yelp.

(Y/N): This is Izuku Midoriya. My friend Izuku Midoriya.

They all introduced themselves to Ryuji and Ana.

Ryuji: I'm Ryuji Godai.

He smiles.

Ana: And I'm Ana.

They started to explaining that they from another world where they live in the world of Quirks and Esper. (Y/N)'s predecessor Tsukasa Kadoya has chosen (Y/N) as the new Kamen rider Decade to travel another world to stopped Dark Decade and Dark Riders and Rider Wars.

Ryuji told him he becomes Kamen rider Kuuga to working with the police and Ana in secretly. And his belt or Arcle warms him about "Dark Decade"

But Ryuji wants to protect the smiles of a people like Original Kuuga did.

Izuku: Sugoi! That sounded likes All Might.

He smiles thinking about the number 1 heroes he admired.

(Y/N): That's right.

Before he glances at Ryuji and Ana with a serious tone on his voice.

(Y/N): Got any questions if you like?

Ana: How long.... you're going to be in our world?

(Y/N): I really don't know, but we can't leave this world until our purpose is to complete and leave this world. So expect the Decade to show up a lot of times in your battles. And don't give us to the police. Besides me and my friend started to working at the Unidentified Lifeform Counter Department.

He told his fellow rider.

Ryuji gets up and look at (Y/N) and smiles.

Ryuji: Don't worry, (Y/N) your secret is safe.

Ana: If Ryuji do it to his secret and I'll keep your identify safe.

(Y/N) looked at his new friend in this world are keeping his secret.

(Y/N): Minna, arigato.

He smiles at them.

They all shared the warm smile and then Izuku snapped out and realize about the grongi.

Izuku: That's remind me why do the Grongi killed all those womens?

Made them goes curious looks thinking about the grongi.

(Y/N): We don't why but we do know about the grongi likes to make their games and playing the murdering game without fail the game.

Ryuji: That's right.

He nodded.

Rachel: What about their birthday.

They all turns to look at her.

Ana: "Birthday?"

(Y/N): No, no, no.I think Rachel is right.

Izuku: Yeah, properly it's their birthday since they're going to patrol.

He narrows his eyes thinking about the policewomen's brithday were killed.

(Y/N) glances at Ana and Ryuji.

(Y/N): Can you check their brithdays' in their profiles there might be one more person going to attack by the grongi.

He asked her.

Ana: Yes! Leave it to me! I'll tell all my superiors to hear about this.

She nodded her head before leaving  the studio back to the station HQ.

Ryuji: What about me?

He asking pointing himself.

(Y/N): We'll call if you find any grongi.

Made Ryuji nodded his head.

Ryuji: Got it!

He going outside where's his bike park outside, to find the grongi or going to his house waiting to Grongi.

Inside the cave where the grongi hideout is. Dark Decade and Gamino are talking about their discussing of their plan.

Dark Decade: So you set the game, the rule is to kill the police they're on duty without spilling any blood to failed?

Causing Gamino laughing about Dark Decade's statments.

Gamino: That's right! This is rules and games! We'll take over the worlds for ourselves!

Dark Decade: So why you didn't face Kuuga?

Gamino: That's a good question. But not yet, I will face him later.

Making Dark Decade small smiles.

Dark Decade: Is that so?

Back in the Studio

The light room is light by red but turns back into normal light.

(Y/N) is inside the Darkroom, looking at his photos still as terrible at always. (Y/N) looked depressed about his photo shot didn't takes so good.

Made him goes sigh.

(Y/N): Dammit again.

Throwing the pictures away in the water of processing tray.

(Y/N): Everything is no good, then.

Rachel: Maybe this world rejects when there is two Decades.

Rachel: Maybe, it's saying "Dark Decades is Destroyers of Everything and Decade is Connects of Everything."

She smiles at her foster brother.

(Y/N) throws out everything of the photos on the processing tray in water.

(Y/N) and Rachel got out of the Darkroom, before going to the living rooms.

(Y/N): I don't know.

Rachel: You don't know?

(Y/N): It's a same of this.

He picking up the Riders cards, while Kuuga is sealed with grey.

(Y/N): We're supposed to travel all different worlds but....

He getting his Ride-Booker. Opening it up, taking out a cards to looking at it revealing, it's not a Rider-cards some sort of special attacks and final form.

(Y/N): This isn't a card of riders.

Izuku comes here to the Living room, until (Y/N) spotted him.

(Y/N): Izuku, good timing!

Izuku: Eh? What is it, Y/N) kun?

(Y/N): I need you to research this new cards.

Izuku: Eh? A 'new cards?'

He takes the new cards.

(Y/N): Yeah.

He nodded his head.

(Y/N): This is a new types of Cards, I need you to check it.

Made Izuku narrows his eyes with determinate/curious mind expression and nodded his head. 

Izuku: Yeah, got it!

He rushes back to his room, he's going to research about the new cards aren't the types of riders possibly going to the new worlds in the future.

He rushes back in his room where the quest room is.

While (Y/N) cross his arms and release the sigh.

(Y/N): I really don't know what to do.

Until (Y/N) heard a phone call ringing, he glances at it.

(Y/N): Who it is anyway.

He picks up a phone and answer it.

(Y/N) Moshi, moshi, (L/N) here? Ah Ana-chan!! Eh?! Really?!

After (Y/N) tolds Rachel to stay here in the Studio, Ana called Ryuji and (Y/N) to comes here in the mountain about the urgent.

(Y/N): What you mean you're theory is wrong?

Ryuji: Yeah, what is mean your theory is wrong, Ane san?

Ana: Look.

She gave them a map to looking of the red lines with 4 x and 1 circle are 4 female cops are dead and last one standing and the black triangle are mountain.

Ana: Those are where a female cops were killed. They're all same distance from Mt Hitoki. We don't know if next female cop is.

(Y/N) is thinking for a bit until he realizes something and put on serious on his face.

(Y/N): I know the next female cop is.

They all glances at him with surprised look.

Ryuji: You know who's going to attacks the cop?

(Y/N): Yeah. The next female cop is going attack.... here.

Ana: Huh?

She looks surprised.

Ryuji: So, what this mountain's special about it?

(Y/N): This is a Grongi ruins. Sleeping there is the ultimate darkness.

He pointing where the cave is. Before glances them both in serious face.

(Y/N): To retrieve it, they'll use a different "gegeru" than usual. Seems like, they're been playing a game.

Ryuji: You sure know a lot, (Y/N) but why a police women?

(Y/N): Ah! Their birthday doesn't matter. But there five locations equidistant from the mountain, fighting the Rinto women. In short the rule to kill five female cops.

 He explaining about the rules and females.

Ryuji: But why the females and who is the last one.

Made Ana realizes something.

Ana: I see... If the Police guards are focused on the Police Headquarters no females cops would comes here.

(Y/N): Yeah the only last female cop is.... you Detective Ana.

He turns to point at Ana in serious face. 

Causing Ryuji and Ana to be shocked that herself is the last one of the females cops.

And (Y/N) narrows his eyes in serious sensing that, they're not alone in this mountain are being watch by. His waistband alerted him of warming.

(Y/N): Ryuji! Keeps your guard on.

Ryuji: Eh? Why?

(Y/N): They're here.

He pointing his index finger where the tree is, suddenly something came out of the trees revealing a grongi watching them a whole time making them surprised expects for (Y/N) knows about it. 

At Studios, Rachel staring at the mountain but suddenly the same Dimensional Wall next to the mountain.

Rachel: They're in this world.

She rushes to where the mountain is.

In Izuku's room, he looking at the new types of card aren't belongs to Riders, he started to research about it.

He accidentally dropped the cards on the ground, he going to picked it up but he widely openly seeing the vision of the past riders but with their allies fighting dark riders.

After the vision ended, causing Midoriya panting, breathing in and out before turning to the cards.  

Inner Midoriya: What was that?

Back in the mountain

They kept their guards on seeing the grongi surrounding on them.

Female Grongi: The gegeru has started! In grongi language

She jumps off the tree and landed on the ground.

Male Grongi: If we're killed the Rinto warrior, it'll be done! In grongi language

(Y/N) looking at the grongis surrounded on them.

(Y/N): This time, it's on two? In grongi language

Ana: But even the linguists weren't able to decipher it.

(Y/N): If they killed a fifth Rinto here, the ultimate darkness will get enough powers to destroyed humanity.

The grongi getting off the rocks and landed on the ground, walking calmly to preparing to kill Ana made her faces goes frightened. 

And Ryuji goes to in front to protect Ana.

(Y/N): Sorry Ryuji and Ana.

Ryuji: Hu....?

Before he could say anything but (Y/N) shoves him with one arm before he turns to Ana suddenly he punched her with the fist in the face.

She moan in pain while her hands covers her face.

Ryuji: (Y/N)! Why would you do that?!

He asked in anger and demanding voices to seeing his friend punches on the detective.

(Y/N): Look carefully.

He pointing the blood is dripping landed on the rock revealing the owner of the bloods belongs to Ana her nose has nosebleed when (Y/N) punched her.

And made the Grongi stopped and gasped in shocked seeing Ana is nose bleeding dripping on the rock.

Female Grongi: The Rinto warrior's blood has been spilled! In grongi language

Male Grongi: The sacred Gegeru is a failure! In grongi language.

(Y/N): In so far, that they killed other four without spilling a drop of blood.

Ana while looking at the blood in hand in awe.

Beginning a flashback images of four dead females cops with no spilling of bloods.

Voiceover (Y/N): In the sacred  gegeru, the most important rule is to kill without spilling a drop of blood.

Flashback images ended back to (Y/N) with Ryuji and Ana.

(Y/N): But they failed, for blood has been spilled!

He smirked for foiling the grongi to prevent Ana from getting killed.

Ryuji: (Y/N)! How did you know?

(Y/N): Chuckles Let's just say that my intelligence minds tells me that is to save Ana's life, let's go Ryuji!

Made Ryuji smiles and nodded.

Ryuji: Right!

(Y/N) takes out his Neo-Decadriver places it on his waist until the belt emerged to connects on his driver and Ryuji places his both arms on his waist summoning a Arcle appears on his waist.

(Y/N)/Ryuji: Henshin!

Kamen ride: Decade!

Both riders transformed into their main form. Made the Grongi shocked seeing Decade appears in their world.

Male Grongi: D-Decade?! In grongi Language

Female Grongi: He's the one appears and foiled our plans! In grongi language

Male Grongi 2: Let's killed them! In grongi language

At Decade and Kuuga staring at the grongis.

Decade: Let's go, Ryuji!

Kuuga: Yeah!

He nodded his head.

They let out a battle cry rushes in the battlefield and even Grongi toos, they begins to fight each other while Ana hiding behind the trees while watching.

At Decade, he punching and then palm strikes at the another grongi to hitting on the chest sending a Grongi flying off a cliff.

He jumps spin kicks, hitting their cheeks, falling on the ground, suddenly the grongi appears behind at Decade with the swords attempting to slash him but Decade blocks it with his Ride-Booker transformed into Sword mode.

He parried attacks at the Grongi causing it to stumbled and Decade kept slashing them, they were intensely overpowered.

He takes out a new card places it in his driver.

Attack Ride: Slash!

The sword is covered in pink energy started to attack the grongi with the silhouettes blades kept several attacks before the grongi is destroyed. 

He swipes his sword with his hand.

 At Kuuga side, he kept punching at them, he round kick at the Grongi's chest sending flying off the cliffs.

The Grongi tried to round kick at kick but he's dodged it under it before getting up, he punches it at the chest sending on the ground while rolling it.

He looks at the nearby stick, he grabs it before he transformed into his form.

Kuuga: Chou henshin!

He transformed into dragon form and the stick transformed into a staff weapon.

He twirls his staff before attack and swinging hitting the staff to the Grongi's chest and the other.

He stabs the grongi with the staff through on the chest, sending it flying and rolling on the ground and then the marks appears on his chest.

Causing the grongi exploded.

And Kuuga joins up with Decade before changing back into his default form, standing next to him before finishing a final attacks.

Kuuga: Let's go!

Decade: Yeah!

He takes out of the Final Attack Ride.

Final Attack Ride: D-D-Decade!

10 holographic human sized appears in front of Decade leading the grongis, while Kuuga making a stance his foot burst in flame.

They jumped in the air doing a straight kick position, Decade gets through the cards leading to the Grongis were easily overpowered destroyed by their Rider Kicks.

They landed on the ground, before turns to the grongis causes them to be exploded.

They stood up before glancing each other.

Kuuga: Yeah!

Made smiles in excitement under his helmet giving Decade thumbs up.

Making Decade chuckles under his helmet.

*Clap*

*Clap*

*Clap*

Suddenly they heard a clap, they all glances at behind them. Revealing Dark Decade is wearing a cloaks and clap gently.

Decade: Who are you?!

Dark Decade: Well done, (Y/N) (L/N) and Ryuji Godai. Chuckles

Causing Decade and Kuuga to be shocked that man knows his identify.

Suddenly he takes out similar and different colors of Decade.

Kuuga: That's driver!

Decade: That's driver....

He mutters and thinks for a minute before realize whose that drivers belongs to.

Decade: Don't tell me!

Dark Decade places Decadriver Dark version on his waist the silver belt emerged on the belt to fit on the waist.

He opens the driver before taking out the card.

Dark Decade: Henshin!

Kamen ride:

He shut his driver close.

Dark Decade!

He transformed into Kamen rider Decade made them shocked seeing him here.

Kuuga: That's....

Decade: Yeah, that's Decade, the destroyers of World, Conquers of the World, the Destroyers of All good riders. That's Kamen rider Dark Decade the leader of Dark Riders.

He explaining about Dark Decade.

Kuuga: Dark Decade! The arcle warms me about him!

He shouted in shock.

Causing Dark Decade laughing at them.

Dark Decade: That's right, I'm taking this.

Decade: We're not letting you taking his world.

Kuuga: Yeah!

Made Dark Decade scoffs.

Dark Decade: Fine then.

He jumps of the cliff, landed on the ground both good riders charging to Dark Decade, Decade on the right side pulling back his fist and Kuuga and left side pulling back his arm rushing while Dark Decade standing there.

Before they could punch at Dark Decade, suddenly Dark Decade grabbed both Rider's fist made them goes shocked.

Decade: What?

Kuuga: No way....

Dark Decade: Fool, did you honestly think that'll work? 

He cracking their fist making them groan in pain for a bit and leg stumbled for a bit, before he threw their fist away and palm strikes at their abdomen sending flying away.

They all landed and Kuuga stood up and facing Dark Decade in angrily.

Kuuga: You bastard!

He rushes to charging and jump in the air before striking his fist to Dark Decade but bad lucks for him. Dark Decade takes out his Ride-Booker in gun mode, pulling a trigger blasting at Kuuga shock came out.

Causing him fall and rolling on the ground making his friends goes worried.

Ana: Ryuji!

Decade: Ryuji!

He struggle to get up while Dark Decade turns and looked at his good counterpart Decade.

At Rachel, shes rushes and arrives at the scene, she gasped because she's spotted Dark Decade while foster brother struggled to get up and Kuuga on the ground.

Rachel: It's him.

She mutters about Dark Decade.

Back in Rachel's dream/mind

She saw Decade and Dark Decade are picking off last time of their battle, they engaging of the sword fights both Decade gained advantages.

Rachel looks at Decade in worried look until she hears someone getting up. Suddenly someone passed through her wearing a black spiky and yellow lines armor, revealing Kuuga. He seeing two Decades fighting before rushing to join them.

Dark Decade was about to stab at Decade but Kuuga appeared shielded his friend. Suddenly Decade and Kuuga looked at Dark Decade's sword....

Through Kuuga's abdomen. Dark Decade pulled out of his sword making Kuuga complete fall motionless on the floor. Decade shook kuuga but no response.

Decade: Kuuga? Kuuga?

Decade looked at the sky.

Decade: KUUGA!

Decade screamed for the loss of their friend and Rachel shedding tears for their friend. Decade glaring at Dark Decade before picking up his sword presuming the battle.

Rachel's dream/ended.

She shook her head before getting back in the reality seeing Dark Decade is standing here while Decade getting suddenly he blast at Dark Decade in gun mode but Dark Decade deflects it in sword mode.

Decade rushes to his friend's aid, helping him to get up.

Decade: You okay?

Kuuga: Yeah.

He nodded before he glances at Decade.

Kuuga: You aren't kidding that guy is tough and different level.

Decade: Yeah, how about how we beats in combat sword.

Kuuga: Good idea.

Decade helping Kuuga to get up and feet on the ground, before Decade turns his Ride-Booker into sword mode and Kuuga transformed into new form.

This is titan form.

He going grabbing the sword transforming into Titan sword.

The two riders are charging at Dark Decade, they all engaged in sword fights while their weapons are locking before deported back unlocking their sword.

Decade takes out his card Slash attack ride again before insert it.

Attack Ride: Slash!

And even Dark Decade too.

Attack Ride: Slash!

Kuuga rushes to charging at Dark Decade, he blocks it their sword locked each other.

Kuuga: Now (Y/N)!

Decade jumps in the air, before attempting to slash down overhead at Dark Decade suddenly Dark Decade headbutted on Kuuga and roundkick at the abdomen making Kuuga rolling on the ground. And Dark Decade counter attack at Decade's chest several time before rolling on the ground.

Kuuga: (Y/N)!

Before he glared at Dark Decade.

Kuuga: You bastard!

He rushes to Dark Decade, tried to slash him but he kept dodging easily and Dark Decade countered attack him, sending him near at Ana.

Decade: Ryuji! 

Kuuga glances at Decade.

Decade: If sword fight not enough, then we'll have to gun fight!

Kuuga: Right!

He nodded his head.

Decade turns his Ride-Booker in gun mode, pulling the trigger blasting at Dark Decade while he busy to deflect the blast.

Kuuga: Let me have that!

Taking a gun from Ana's hand.

Ana: Ryuji! Don't!

Kuuga transformed into Pegasus form.

He and Decade shoots to together kept shooting at Dark Decade, he dodge before rolling changing it into Gun mode.

The two riders running around keep firing at Dark Decade, he takes out new card.

Attack Ride: Blast!

Dark Decade shooting his gun rapidly silhouettes appears, blasting them on the chest.

At Narutaki he secretly spying on Dark Decade and Decade and Kuuga fighting each other and than turns away.

Narutaki: Decade you shouldn't be in this world. And who will wins? Decade or Dark Decade?

He narrows his eyes.

At riders while fighting the leader of the Dark Riders, before he leaped away getting on top of the roof.

Decade: What wrong? Too scared to fight?

He taunts at Dark Decade.

Dark Decade: Not exactly but I leaving you to them.

Kuuga/Decade: Them?

Dark Decade snapped his finger summoning the Dimensional Wall, summoning a new dark riders.

Revealing to.....

Kamen rider Gaoh

And Kamen rider Dark Drive.

Decade: What?!

Dark Decade: I'm leaving you guys to do it.

Gaoh: Well, let's the fun begins!

Dark Drive: Mission accepted.

Dark Decade nodded his head leaving a dimensional wall and vanished leaving the riders facing another evil riders.

Gaoh: So then. Let's go!

They picks up their mains weapons before rushing in, while good riders making a stance in defends way.

To be continued