Here in the large Wedding hall in the Underworld are two Mirror Riders battling it out. Ryuga and Ouja clashed swords with one another as they pushed each other back. The dragon rider took this chance to give Ouja a knee to the gut and then a roundhouse kick to the face, making the Cobra back up..

"You're good. But is that all the best you can do?" Ouja spoke.

"You creep me the hell out." Ryuga said, charging a punch at the masked murderer.

Ouja rolled to the right and avoided the punch, before slashing ay Ryuga's chestplate, making sparks fly.

''Argghh...bastard" Ryuga said.

He took out his Advent monster card and scanned it..

Advent!

Dragblacker rose from landmark portal and Ryuga pointed at Ouja. The black Chinese dragon obliges and roars, charging at the Cobra rider..

"Some trick..'' Ouja said, then did the same and scanned his card.

Advent!

Venosnaker charged straight at Dragblacker. While Ouja was looking at his "pet" taking on the Chinese dragon, he nearly didn't hear another card..

Strike Vent!

Ouja turned, only to be blasted with dark blue flames from the Drag Gauntlet by Ryuga before being grabbed and shoved out a window, making both fall to the ground.

The devils was witnessing y/n fighting against Riser's Murderer and felt interest on the boys power. Most of them were considering making plans on how to persuade him to join their peerages: Marriages between women, Seduction, and persuading.

Koneko: *scoffs* Scumbags..

Asia: Y/n must be really powerful to be asked by do many.

Akeno: My, my..Y/n kun is getting popular nowadays~

Rias: Oh, Akeno..

Sirzechs was watching

[Back to the rider's]
Ryuga and Ouja tumbled down multiple rocks until they landed on a river. Ryuga's left shoulder started throbbing in pain, but he ignored it to continue fighting..

"Alright. Let's power up." Ryuga said, as he took his Survive Yami Card out.

"You think you are the only one, dragon?" Quja spoke.

He then reached into his own advent deck and took out a familar card, which surprised Ryuga. This was another Survive Card, but the outline was violet, the readers on top of the card were blue. The Wing was light purple with a stream of swirling poison as the background.

*another edit by me*

Ouja's Visor became a wrist-mounted shield and sword, much like it had with Knight Survive, only the shield was cobra-themed and the sword looked much like Ouja's normal sword. When he placed the survive card onto his arm mounted visor, he then whipped out a long seord/whip with a stinger..

Survive!

Wicked-looking blades jutted out from the armor on his shoulders, and armor extended down from his helmet to better protect his neck.

"Son of a..bitch" Ryuga said

Ouja Survive cracked his neck before charging at Ryuga, who had no choice but to scan his own Survive card. A dark fire burned around him, trying to keep Ouja at bay. The Drag Visor disappeared from his arm in a swirl of flames, forming the Zwei version in his hand. He placed the card in the Drag Visor Zwei, and his Survive armor formed over him in a burst of fire. A blade then extended from the Visor, and he charged at Ouja Survive.

Their swords clashed with a tremendous amount of force that made Ryuga's arm ache. Belatedly, he remembered hitting his arm onto a sharp boulder earlier falling, and he knew he was going to have a hard fight of it. He'd been able to forget about it in the heat of battle before, but now he couldn't focus on the fight. Too many things were worrying him, and it made it hard to forget that he'd been hurt.

Ouja's sword struck him wherever his armor was lightest-his arms, his middle, his legs. Ryuga struck back as fiercely as he could, but his arm was too sore to hit him hard enough to really be effective.

Another blow to his face sent the dragon rider reeling, making it impossible for him to counter Ouja's next strike to his arm. It took all of his strength not to drop his Visor, and he quickly scanned his next card.

Advent!

Dragraider roared as it flew into battle, its form shattering and evolving into Dragraider.

A storm of dark fireballs rained down on Ouja, forcing him back as he reached for a card and quickly scanned it..

Final Vent!

Venosnaker arrived and evolved into its Survive form, Venoviper. Spitting venom, it transformed into a motorcycle, and Ouja leapt onto it. Ryuga hurriedly scanned his own Final Vent card, but Dragraider barely had time to complete the transformation before they were hit. Dragraider exploded violently, but didn't go anywhere as Ryuga had been blasted by the venom and the shockwave. He landed several feet away, as Ouja laughed and walked towards

"Feh," Ouja commented, bored. "How vexing; you about to die so easily. And they say that you ate dinner that Ryuki."

Ouja raised his sword to perform the finishing blow..

"Sayonara, Reptile!"

Ouja was about to stab, until a new sound was heard..

Strike Vent!

Ouja was then blasted by a hard stream of water, making him tumbled a few feet onto the ground..

"Grr..WHO DID THAT?!!" Ouja Spoke..

Restore Vent!

Ryuga felt his body being healed, as his shoulder and chest stopped hurting..

"Huh? Who did that" Ryuga Spoke.

???: I did, buddy.

Ryuga turned to the familar voice he heard. He saw a new rider with a Shark motif offering a hand. Ryuga gladly took it and got himself up..

"Glad you came around..Nobu" Ryuga smirked

"Well, y/n..i can see that you got your black ass handled" Nobu said

''Fuck you, dude.." y/n retorted, with a chuckle

[With the devils and fallen angels]
Raynare and Asia felt worried of y/n, being beaten by Ouja. Falling from that cliff must've damaged him a little and maybe that's the reason why he's not fighting well..

Asia: Y/n..please dont die.

Kiba:

"You..will pay for this" Ouja spoke in Malice.

"That won't be happening" Nobu spoke

He then took out his own version of a survive Cardn but it was blue and had a whirlpool motion..

A shark like gadget appeared onto his left hand. Abyss then inserted his survive card and scanned it.

Survive!

A geyser of water surrounded the shark rider and his armor started changing. When it died down, abyss was into his survive mode

"Neat" Ryuga said

"So..let's kick this serpent's Ass" Abyss said, as Ryuga raised his sword

"Right." Ryuga said

Both riders started charging

[Stardust Crusaders]

Rias and the others watched as another Male rider appeared, attacked Asakura and help Y/n up..

Rias: Another Kamen Rider?

Ni: Whoa...and hes a shark too?

Isami: Damn..

Sirzechs: *thinking* A new rider..I wonder if hell be perfect for my sisters peerage.

Grayfia: Be careful out there..Nobu.

[Rider Fight]
Both Ryuga and Abyss charged straight at the purple rider with their sword weapons, as Ouja tried to strike them with his whip/sword. Tue two evaded the attack and gave Ouja a double strike with their swords, forcing the murder back..

"Ahh..damn you" Ouja growled as he took out some cards and scanned it..

Advent!
Advent!

Two large reflective surface appears and out came Metalgera, the survive evolved form of Metalgelas. It was three times the size of a normal humanThe entire body was technologically enhanced with dark grey paddings and the horn was bulkier and longer..

I really couldn't find a survive form of Metalgelas, so this would had to do. Imaginethebfeet has gold toes, longer horn and red linings.

The other contract monster was an Evolved version of Evildiver

The Advent beasts charged straight of the two. Ryuga dodged Exodiver's soaring strike, while Abyss ran from Metalgera's Shockwave charge.

"Whoa!!" Abyss yelled, evading a charge attack from it.

Ryuga saw Exodiver diving for another strike. Ryuga takes out a card and scans it..

Shoot Vent!

He aimed his weapon which DragRaider followed through from behind as well, charging up their attacks. Exodiver came and before the advent monster could realize the danger it's in, Ryuga and his contract beast shot at Exodiver, causing some damage and making it crash to the ground in pain..

"Boom" Ryuga said, as he took out a lone contract card.."allow me to become your new contract master..

The card glowed brightly as it hummed. Exodiver felt itself being pulled into the card. Ryuga took a glance at the card which now has Evildiver his esigna on it

Abyss was still being chased by Metalgera, trying to ram him with it's horn..

"I gotta trap that thing somewhere where it could get the horn stuck" Abyss said, as he saw a thick wall of bedrock, coated in a sticky substance.."perfect"

Abyss led the giant humanoid rhino onto some bedrock. He stood behind the spot as Metalgera charged at him. At the last two seconds, Abyss ju.ped out of the way and made the Contract beast crash into the wall. Now covered in highly sticky sap, Metalgera struggled to get it off and get out of the rebound trap..

"I can see that you have this thing encased in..this sap" Ryuga said, watching his work.

" Yeah. What it is..it's holding it good" Abyss spoke.

"Good.." Ryuga replied as he took out another Contract card.

Abyss saw what he was doing and stood back

"You are gonna try and tame this thing for yourself?" Abyss spoke

"That's Right. Plus, I think it could use a new caring owner." Ryuga spoke.

He held his card in front of the Rhino mirror monster. A white light surrounded Metalgera stared blankly at the rider holding the card in a trance-like state. The light dimmed down and the advent beast was reverted back into Metalgelas and it seems to be in a calming manner..

"Well..did it work?" Abyss questioned Ryuga.

Instead of talking, Ryuga shown the shark Rider not only his Newly Evildiver, but also the Contract monster he has obtained

"Damn. That's what i would call a haul" Abyss Said.

"Now all there's left to do is take down Ouja once and for all" Ryuga said

"Yes..let's end him" Abyss replies, as he and Ryuga charged at him

Ouja felt his power weakened. Almost like something was taken from him..

"They took my prey. They will pay!" Ouja growled.

He then saw the two riders coming at him. He signaled Venoviper to strike at them, but DragRaider and Abyssodon pushed it back, preventing it from going after their masters. Ryuga took out two trick vent cards and gave one to Abyss. They both scanned them..

TRICK VENT!

Multiple clones of the said riders appeared from their sides and they ran around Ouja, confusing the hell out of him. He frantically lashed out by trying to whip all of them, seeing if he could hit them.

"WRRAAHHH!! STOP MOVING!!!" Ouja shrieked

Strange Vent!
Strange Vent!

Ouja couldn't look back I'm time as he was struck by a double punch by Ryuga and Abyss, sending him flying. His armor convulsed with purple colors as his survive form degenerated back to his base form.
Vemoviper also was affect by this and reverted back to Venosnaker. When he looked on himself, he was not happy..

"No, no, NOOOOOO!!! This cant he HAPPENING!!!" Ouja yelled in vain, while Ryuga and Abyss commanded their Beasts to attack..

"DragRaider"
"Abyssodon!"

"Scatter Shot!" Both Riders shouted.

Abyssodon's side cannons opened and Dragraider opened its mouth as they both started raining fire and blasts on Ouja's weakened state. Each of them hit him directly as a cloud of steam filled the area. The smoke was down, and we can see Ouja far from the riders onto the ground, trying to stand despite his agonizing injuries. Pieces of his armor broke off to reveal half of his face and torso..

"Why won't you two die?!!!" Asakura shrieked as he charged forward, despite the pain.

"Let's permanently end this son of a bitch." Ryuga said to Abyss and pulled out a final vent card.

"With you, dude" Abyss replied, pulling out a final vent card

Both Riders opened their visors and scanned their cards together

FINAL VENT!(x2)

Both DragRaider and Abyssodon flew down and shifted into motorcycles for Ryuga and Abyss to ride. They got on the vehicles and drove towards Ouja. Abyss was then Covered in a spiraling drill made of Crystal clear water, while Ryuga did a wheelie with DragRaider huffing out dark flames.

"DIE MOTHERFUCKER!!" Abyss shouted as he rammed through Ouja multiple times.

DragRaider fires multiple fireballs at the Murderous rider before it and Abyssodon collided together with him and crashed into Ouja, causing a massive explosion. Debris were sent flying, shockwaves forced the devils and fallen angel back a few feet. When the smoke clears, Ouja was inside the mirror world from the reflective surface he summoned standing motionless, with his advent deck falling from the sky. Ryuga caught it with his hands and he held onto it. Asakura thought he survived, until his armor started shattered like glass and he fell hard to the ground.

"No..no! I refuse to let it end like this" Asakura yelled.

He then attempted to stand, only to see that he had been pierced through his heart by a sword from Kamen Rider Abyss behind him. He looked behind to see the Cold stare of Kamen Rider Abyss looking downly at him.

"This is for my parents and everyone you have killed and tormented, you sick fuck.." Abyss spoke with venom and violently ripped his weapon out of him

Abyss now watched the body of Asakura Takeshi is dissolving. He looked in horror as he his dying..again. Left with no power, no contract beasts, and nothing else...Asakura panted frantically until he uttered one final scream..

AAAAAAAGGH!!!!

He screamed With that, his body has then dissolved into nothing. The murderer, responsible for many deaths..is finally gone.

"Finally...he's gone" Abyss said.

[End of fight]

Ryuga de-henshined back to y/n and he heard what Nobu had said and felt sorrow for him losing his parents to that monster. But? At least he can feel confort that his friend got his vengeance and avenged his fallen ones. Abyssis friend came out of the mirror and de-henshined back to his normal attire..

Y/n: How do you feel, Nobu?

Nobu: Satisfied..know he will burn in eternal he for his murderous personality. Now, what are they gonna do with that? *points to the Ouja deck*

Y/n took a glance at it and thought no one should use this again. He decided to summon Chaos in his left arm, which surprised Nobu and crush the deck to dust, breaking the contract with Venosnaker. The cobra Advent Beast took a glance at y/n as it tried to move closer to him, if not for DragRaider and Abyssodon hiding it back.

Y/n: No, no..*takes put a final Contract Card from his deck and holds it up* Let it come to me

Nobu: Are you sure that's a good idea?

Y/n: Yes.

Nobu: Very well. Abyssodon, let it go.

Both DragRaider and Abyssodon obeyed their contractors and allowed Venosnaker to come. it first hissed at Y/n and wrapped itself on y/n, spewing saliva..but he wasn't fazed. Y/n held up the contract card in front of him and Venosnaker was caught in a trance like Metalgelas. After a few moments, it released itxs hold onto him and hisseed silently in a way it sounds tamed. Y/n smiled at the new card he has required..

Y/n: Welcome to your new family, Venosnaker.

Venosnaker hissed in joy, along with DragRaider and Abyssodon roaring with their new ally on their side.

Nobu: *walks up to y/n* You are full of surprises man. You know that?

Y/n: Not even close. *turns to the Advent Beasts* You three have done your jobs. You can go back now.

The Mirror monsters then made their way to the mirror surface, back to their homen before it shattered into pieces.

Y/n: Let's get to the others. They must be worried about me.

Nobu: Others?

Y/n: My three girlfriends and friends.

Nobu: Wait..Three Girlfriends?!?

Y/n: Yeah. *grabs nobus arm and Summons his dragon wings* Let's fly!

Nobu: Wait! Fl-

He gets cut off as y/n started Soaring into the air..

Nobu: AHHHH!!! I HATE YOU, DUDE!!

Y/n: Noo, you dont.

[Back to devils]
They have all witnessed the Rider's Abyss and Ryuga take down Ouja in a matter of minutes. Most were impressed with their display of extraordinary power and had been planning on how they can get them in their own set of peerages. Isami and Akeno saw the display y/n showed with his survive form and felt turned on by the raw strength of it..

Isami: D-damn. Such power....

Akeno: He's like a God in hiding.

Asia: I'm so glad to have him with me.

Mittlet: Amazing..

La

Most of Riser's Peerage felt incredibly shocked of how a normal human can display such abilities. They got to thinking of their own

Ni: Sister, did you see what they did?!

Li: Yeah!! Y/n was so strong. His power made my legs shake

Xuelan: *thinking* Y/n is so remorseful with his skills. I think he can be worthy of being with me.

Karlamine: *thinking* His skills is incredible..I must stay by his side.

Mira: *thinking* Y/n is so FREAKING AWESOME!!!

They hearing the sound of flapping wings a d they turned to see y/n coming him with Nobu in his arms. Everyone then gathered and surrounded the two with questions and comments..

Devil lord: You two boys must come be a part of my peerage.

Woman: Hell to the no! They belong to me!!

Man: Screw you, you hag!! Their mine

Many gave lots of outbursts, trying to get them for themselves making the two riders feel overwhelmed until..

Sirzechs: ENOUGH!!

All the devil's freezes at their king's booming voice running through the messy wedding. With everyone quiet, the devil king started speaking.

Sirzechs: I'm sure everyone is excited about these two boys and their abilities, bu it serve no reason to crowd upon them like a bunch of savage's. Also, the Black Dragon Emperor is excluded from ever being turned into a devil or be in anyone's peerages.

A lot of devils whiled and complained about this misfortune. Sona also felt discomfort that she won't see much of him often. Another

Sirzechs: And as a reward for defending our kind and defeating Ouja, I decided to upgrade your living place and compensate you for your troubles.

Y/n: Really?

Sirzechs: I believe you will like it. *turns to Nobu* And who are you, my friend?

Nobu: Nobu Hayate

Sirzechs: It's a pleasure to meet you. I was surprised for you to be another Kamen Rider.

Nobu: Well, it is my first time using it. Honestly, I'm surprised that i can use it wisely.

Sirzechs: That begs a question.. is there other Kamen Riders in our world?

Y/n: I highly doubt it. They are still from the world me and my friend came from.

Sirzechs: I see. I won't keep you boys anymore of your time. I'll send you to y/n's home.

Y/n: Ok.

???: Wait!!

[Y/n's POV]
I turned to see Ravel, a few of the Phenex peerage girls, as well as Kalawarner and Mittlet coming to me and the Phenex girl jumped on me and made me fall to the floor

Ravel: *pleading while buzzing his chest* Please dont go..

Ni: We don't want you to go back..

Li: Not without us.

Y/n: Huh?

Karlamine: *knees down to me* Your raw power cannot be ignored. Plus...*starts blushing* I want to be with you too.

Ni and Li: Us too..

Xuelan: I want to be worh you more. And..I'm sorry for what I said back at the rating game.

Y/n: *To the fallen Angel's* What about you two?

Mittlet: W-well..I think you are an awesome guy.

Kalawarner: You intrest me, and I want to make up for trying to kill you.

Y/n: It's fine.

Sirzechs: Well..that's unexpected. So you ladies feel the same way with Raynare and Asia?

Girls: We do.

Sirzechs: Then, I'll allow you all to stay and be with him. You can also stay with him, Raynare and Nobu in the new home.

Girls: *eyes sparkle* Really??

Sirzechs: If it's ok with those three.

Nobu: I'm fine with it.

Raynare: I would like that.

Y/n: The more the merrier.

Ravel squealed with happiness and decided to place her lips onto y/n's and wrapped herself around him.

Ni: Hey! You can't hog him all to yourself!

Li: We want some too.

Basically, every one of the girls had a turn kissing the Dragon emperor, while others watched.

Akeno: He's getting more popular than ever.

Koneko: *thinking* Y/n kun..

Isami: I hope to get my chance one day.

[Timeskip]
Everyone was sent to their own respective homes after the wedding and battle was done. When y/n and the girls appeared to their supposed home, they were shocked of how it looked now

Y/n: God-damn.

Raynare: *wraps arm around his left one* Sirsechs really like to show off his skills.

Ravel: *wraps herself on the other arm* It is perfect for all of us.

Y/n: Let's just go inside.

They all entered the house and were amazed by each structure of their living space.

Living room:

Kitchen:

Basement:

Y/n's room:

Raynare's room

Ravel's Room

Xuelan's Room

Ni and Li's Room:

Y/n then saw a rectangular box on front of his desk. He went to it and opened it to reveal a motherlode of cash

Y/n: Yeah..I'm gonna enjoy this

[Somewhere in a portal]
Traveling through a dimensional portal is a another mirror rider. He wore a black full bodysuit with gold gauntlets and boots. His chest armor was black with a royal red, nearly bronze, emblem in the vague shape of a phoenix. His helmet was bronze with larger version of his phoenix emblem as the faceplate, with several black slits to see through. In his left hand was a long, golden staff with a phoenix at the top, its wings folded over to resemble a shield and a golden hand guard that could slide up and down. This is Kamen Rider Odin..

Odin: Ryuga is gaining more power. Maybe he'll put up a challenge when we meet.

He then felt Ryuga's presence in a nearby portal and went through it. Unknown to him, a familar dragon rider was following him: Ryuki, Ren and Yui.

Yui: Do you think we'll find Nobu..and y/n?

Ryuki: I hope so.

Ren: What is Kanzaki planning?