Last time the Legendary Kamen Rider OOO came back to Japan. The heroes will now be working with OOO against Complesinist Q though things won't be easy. Q has something planned for Japan and it is going to take a lot of heroes to stop Q now with that said, let the story begin.

-

Yaoyorozu Residence

After the battle at the beach Compa and Isaac were seen outside the gate of the friend Deku said would help.

Compa: Is this the place? It looks pretty fancy, still not as big as one of the Basilicoms.

Isaac: The address is right, now how do we let them know we're here?

Isaac then sees a speakerphone on the gate and gets off the back and then dials the number Deku gave them and waits for an answer.

Isaac: Um hello? Is this the Yaoyorozu residence? Sorry to intrude, but we were told to come here by Izuku.

Isaac waits for a response then sees the gate unlock and open.

Compa: Looks like we are at the right place!

Isaac Well we shouldn't keep them waiting.

Isaac then gets back on the Ridevendor and drives up to the mansion where they see a black-haired woman with a ponytail.

Momo: So Izuku sent you?

Isaac: Yes, Isaac Dufort, a pleasure.

Compa: My name is Compa, nice to meet you.

Momo did a small bow and then opens the door to the mansion.

Momo: Please, come inside you two must be hungry let me get my chef to cook for you two.

Momo said while Isaac and Compa nodded and got off the Ridevendor and grabbed his hiking backpack. Isaac then pressed a button on the Ridevendor, causing it to stand up and revert back to a vending machine.

Momo was surprised by what she saw but got her composure back and let Isaac and Compa into the house. Once inside Compa and Isaac, Momo led them to the dining area where they took a seat and Momo got the chef to make them something to eat.

Momo: Now with my chef going to make you two food, care to tell me why Izuku told you to come here?

Momo asked which Isaac nodded as well as Compa.

Isaac: A monster attacked the beach they were patrolling. I helped them with it, he asked me to come here so I could share my knowledge on the creature with you and your friends.

Compa: Among other things, we're still new around here so please be patient with us.

Momo then looks at Isaac confused as he did not look like any pro hero she met.

Momo: Are you a pro hero because I never heard of you Isaac.

Isaac: Pro Hero? I'm just a drifter, was a drifter. I now work as an assistant to a very important figure from where I'm from.

Momo: I see well did Izuku say anything else?

Compa: Yes, he said he would bring the other heroes to discuss the knowledge Isaac has so they will be coming here soon.

Momo looks surprised by that statement as meetings usually are held in a couple of days but Compa tells her that her friends are coming today and it must be serious.

Momo: Well while you wait, enjoy the food.

The door to the kitchen opens and a bunch of butlers put down food on the table which Compa and Isaac were shocked by how much food there was.

Isaac: I appreciate the gesture, hopefully I will be able to repay it.

Compa: T-Thank you for your kind hospitality.

Momo: Nonsense you are my guest you do not owe me anything now enjoy the meal while I call my friends.

Momo said as she left the dining area that Compa and Isaac were now alone.

Isaac: We need to help them as best we can, Q is our problem, not theirs.

Compa: We can only take things one step at a time Isaac, hopefully things don't become too serious.

Isaac nodded and both he and Compa ate while also thinking of a way to stop Q.

1 hour later

After Isaac and Compa were done eating Momo came back to the dining area telling them that the other heroes are here and are ready to know the information they have. Isaac and Compa then headed to the living room where they saw Red Riot, Uravity, Froppy, Dynamight, Deku, Chargebolt, Pinky, Earphone Jack, Tsukuyomi, Dark Shadow, and Ingenium as well as Momo's parents as they both want to know why two strangers were in their house.

Red Riot: Hey, Isaac, how are you?

Deku: How are you liking your stay in Momo's parent's Mansion?

Earphone Jack: Hope things are okay.

Tsukuyomi: Also, thanks for the help you did at the beach.

Dark Shadow: Thanks again for saving our asses.

The other heroes said which Isaac nodded which the other Pro Heroes then introduced themselves plus Momo's parents.

Ingenium: The name is Pro Hero Ingenium at your service.

Dynamight: The name Dynamight you got it.

Chargebolt: Chargebolt and what up?

Froppy: Froppy how are you?

Uravity: Uravity and nice to meet you.

Pinky: Pinky and thanks for helping out friends.

Takashi: My name is Takashi Momo's father and I would like to know why you two are here?

Masae: My name is Masae Momo's mother and I would like to know as well.

With everyone introducing themselves to Isaac and Compa they both go to the center of the room which Issac then realizes something.

Isaac: One moment! I just remembered something very important that should be able to help us!

Isaac then quickly exits the room as everyone hears the front door open. After a minute our two Isaac returns to the room holding what appeared to be a soda can. It was silver on the top and bottom while the center was a black color and had a gorilla on it.

Isaac: Okay, now we can start. Sorry about that, I really should've got one from the Ridevendor before I entered the house.

Dynamight: What's with the soda can?

Momo: If you were thirsty I could have told the butler to get you a drink, Isaac.

Isaac: These cans aren't meant for drinking, here let me show you.

Isaac then pulled the tab on the soda can before tossing it on the table. The can unfolded into a little robot that looked like a gorilla.

Everyone in the room was shocked at the can turning into a tiny robot.

Chargebolt: Woah! It turned into a robot!

Pinky: It's so cute!

The girls of the group nodded while the men just stared at the Gorilla Candroid.

Deku: Isaac what kind of robot is that?

Isaac: You didn't think the Ridevendor just pretended to be a vending machine did you? This is a Candroid, they were developed by the Kougami Foundation along with the Ridevendors to help combat the Greeeds.

When Isaac said Greeeds most of all the heroes were shocked to hear that name well except for Tsukuyomi and Dark Shadow, as well as Momo's parents, who did not understand.

Dynamight: Greeeds!

Uravity: But I thought those things died out!

Chargebolt: Didn't OOO destroy them all!

Ingenium: Indeed I thought OOO had taken care of them.

Pinky: This is really bad.

Froppy: How do we fight monsters from OOO's time?

Momo: I don't know but maybe Isaac knows how?

The other heroes looked at Isaac who was smiling as well as Red Riot, Deku, Earphone Jack, Tsukuyomi, and Dark Shadow.

Isaac: Lucky for you, I happen to be a bit of an expert on the topic! Compa may I have the Holder?

Compa pulled out the O Medal Holder before handing it to Isaac. Isaac then gently laid the holder down onto the table before opening it. Inside were black rimmed Medals. 1 was red, 3 were green, another 3 were yellow, at the bottom of the first side were 2 silver ones. At the top of the second page was 3 blue ones. All of them displaying a different animal on them.

Chargebolt: Hey, guys these things look like OOO's core medals.

Ingenium: Indeed they do look like them.

Dynamight: Yeah, but they're black-rimmed though.

Uravity: Isaac why are you showing us these Medals?

Froppy: Maybe these Medals can help us stop the Greeeds?

Momo: I hope so because I have no idea how we are going to stop them.

Pinky: Isaac how can these Medals help us?

Pinky asked which Isaac turned to others who all nodded as the only way to explain why he had the medals was by demonstration.

Isaac: We'll this is a bit awkward, I'm not used to doing this unless there's a threat, but oh well!

Isaac then grabbed the Taka, Tora, and Batta Artificial Core Medals before pulling out the OOO Driver before strapping it to his waist. Isaac then inserted all three Medals before grabbing the O Scanner off his hip before scanning the Medals with it before holding it up to his chest.

OOO Driver: Taka! Tora! Batta! Ta-to-ba! Tatoba, Ta-to-ba!

Medals spun around Isaac as a symbol formed in front of him before slamming onto his chest, forming armor. In front of all of them now stood Kamen Rider OOO. Half the heroes plus Momo's parents were all silent for a moment until Chargebolt opened his mouth.

Chargebolt: HOLY SHIT! YOU ARE KAMEN RIDER OOO!

OOO: Yes, and I'm here to help stop Completionist Q.

OOO was then surrounded by the other heroes plus Momo's parents.

Froppy: It's an honor to meet a legend in person.

Uravity: This is amazing. Can you turn into the Sagohzo combo next!

Momo: I want to see the Tajadol Combo!

Dynamight: How the fuck are you alive?!

Pinky: You would have to be around your late hundreds!

Ingenium: This is truly a surprising turn of events.

Takashi: Sir, how does that belt work?

Masae: Please tell us it's so similar to those Armored Individuals we see on the news.

When Masae said that OOO turned to her with a surprised look.

OOO: Armored Individuals?

Momo then pulls out her phone and shows a picture of Baron, Zangetsu, Knuckle, and Duke which surprised OOO.

OOO: Oh! I knew that I sensed this was another Kamen Rider's world when we arrived here, I just didn't know which one.

When OOO said that everyone looked confused about what he meant.

Deku: Uhhh, Isaac can you explain what you mean by another Kamen Rider's world?

OOO: Dammit! Makoto is going to have my head for this one! Oh well, too late now I guess. So try not to freak out, but Kamen Riders are all from different worlds in the Multiverse.

When OOO said that everyone became silent until Deku pulled out a notebook with a pen hoping to get some information but was stopped by his girlfriend.

Uravity: Bad Deku! If you keep this up I will be revoking our fun time!

When Uravity said that Deku put the notebook away, Uravity kissed him on the cheek while listening.

Uravity: Sorry, about him when he learns something new he wants to write it down in his notebook so you were saying about this Multiverse thing?

OOO: Yeah, I'm not from this world. That's probably why you think I would be a hundred years old, Kamen Rider worlds tend to share information. I guess you found a book about me that was labeled as a myth or something?

Pinky: You got that right Momo here found a book about you after we were dealing with this Armored guy named Baron.

OOO: I knew the fruit theme looked familiar! This must be Kouta's world then. I only ever met him once when we tried to stop some crazy guy from fusing two worlds together.

Momo: Wait this Kouta is a Kamen Rider exactly which one?

OOO turned to Momo and explained which Rider was Kouta.

OOO: Kouta was Kamen Rider Gaim, he looks like the Armored Riders in that picture. Only he had Orange themed armor and was a samurai. I only met him once, but I think he mentioned something about being a space god?

When OOO said that Froppy froze a bit as Isaac was revealing secrets that could expose the other Armored Riders.

Momo: A space god are you sure?

OOO: I think he was trying to make a joke or something. Honestly space god, kind of ridiculous right?

Compa: Your best friend is a bird monster Isaac, and you work for a goddess, yet that seems far fetched to you?

OOO: I mean yeah, but at least I have proof of that stuff.

All of sudden the door to the mansion opens and Kenji is seen walking inside with a gym back which he then sees the heroes and OOO.

Kenji: Nice costume, make it yourself?

OOO: Thanks! In a way I did.

Kenji just smiled until Froppy pulled him to the side.

Froppy: Sorry, I need to talk to him about something quickly.

Froppy then pulls Kenji away from the other where they find themselves around the corner of the living room and Froppy looks at him with a serious look.

Froppy: Kenji that guy wearing that costume is not a costume!

Froppy whispered while Kenji looked at her confused.

Kenji: You mean he's a Kamen Rider right?

Froppy: Yes, that is OOO Kouta's old friend. He spilled information about him!

Kenji: Really? Well, I think I have an idea, if he's here something serious must be going on. Plus I have something he wants.

Froppy: Okay, but how?

Kenji then leads Froppy back to the others before walking up to OOO.

Kenji: So Kamen Riders are real huh? I'll make sure to switch all those books about you guys to the history section next time I visit the library.

OOO: No need, we don't take credit for our work. Well, at least not as ourselves. Hold on a sec.

OOO then grabs his Driver before straightening the Medal Slot, undoing his transformation.

Isaac: That's better! Isaac Dufort by the way.

Kenji: Kenji Yaoyorozu, anyway why are you here? I mean you wouldn't just stop by to say hello right?

Isaac then smiled sheepishly before he sat down at the table.

Isaac: Right, back on topic. First off I need to know if any other monster attacks have happened recently. Ones that involved silver coins being left behind?

Kenji: Silver coins? Yeah, I had to clean up a bunch of them after a monster attacked our family's business.

Masae: Indeed it was terrifying, a monster that looked like a gorilla and Spider almost tried to kill me and my husband.

Isaac then stood up before bowing to the members of the Yaoyorozu family.

Isaac: I'm so sorry! I lost a few of the Artificial Core Medals to Completionist Q before coming to this world!

When Isaac said Artificial Core Medals and Completionist Q, everyone looked at him and were now curious.

Deku: Artificial Core Medals? So they are not the real ones?

Red Riot: Also, who is this Completionist Q he a villain or something?

Deku and Red Riot asked which Isaac then explained the details.

Isaac: I guess the book didn't tell you what happened huh? Did it at least mention Ankh?

Momo: Yes, you are referring to the Bird Greeed right?

Isaac nodded as a sad expression spread across his face, as a few painful memories resurfaced. The heroes saw Isaac's face and Deku pats his back to make him feel better.

Deku: Isaac are you okay?

Isaac: During our battle against Maki, I was losing myself to the purple Core Medals. Ankh....he gave me his last three Core Medals, including his cracked Taka Medal that held his personality and consciousness. I transformed into Tajadol and we flew up and destroyed the sarcophagus and Maki. Unfortunately it became a black hole that destroyed all the Core Medals. Ankh woke me up as I fell, but this is all that's left of him......

Isaac reaches into his pocket before gently pulling out 2 halves of a broken red Core Medal. It had a golden rim like the originals, and the image of a hawk could be made out in the 2 halves.

Everyone looked at the Medal and felt bad for Isaac as they understood losing a friend.

Froppy: I am sorry for your loss.

Isaac: It's fine, I know I can bring him back. I met an Ankh from 40 years in the future, so that means I do find a way to bring him back! Last time I reunited with him was 4 years ago when I fought alongside Gaim and other Kamen Riders. Of course it was only temporary. Of course now someone else from Foundation X is making Artificial Core Medals.

When Isaac said Foundation X Kenji and Froppy got curious as well as the other heroes.

Froppy: Foundation X, ribbit?

Kenji: With a name like that I'm guessing there is not a humanitarian group.

Isaac: They've caused trouble for the Riders in the past. Particularly Kamen Rider W, myself, and Kamen Rider Fourze. They made silver rimmed Artificial Core Medals that let them make mindless clones of the Greeeds when we were fighting to stop Build and Ex-aid's worlds from fusing together, thus causing their destruction.

When Isaac said that everyone was shocked.

Momo: What were they trying to achieve the annihilation of two worlds?!

Isaac: It wasn't their plan, they were sponsoring the man trying to achieve that outcome. Foundation X is an underground network of influential and wealthy individuals who "sponsor" other organizations as its hosts, allowing them to fund massively illegal projects with phenomenal energetic potentials in return for immeasurable profit.

When Isaac said that both Momo's parents got up and looked angry.

Takashi: What kind of company is that! My Family's company is meant to help people save lives as well as make them even better. This Foundation X is a threat to the very thing my company stands for!

Masae: Indeed, this Foundation X spits on that! They must be stopped! Isaac, we are willing to give you our resources to stop this Foundation X from trying to destroy our world. Millions of lives are at stake.

Momo's parents said which surprised everyone except for Isaac as this feels nostalgic for him.

Isaac: This reminds me when the Kougami Foundation supported my fight against the Greeeds. If only Victor didn't stay back in Gamindustri, then it'd be like old times.

Takashi: Then it is agreed. Yaoyorozu Enterprises will be supporting OOO until Completionist Q is taken care of. Isaac you have our support if you need anything please tell us.

Isaac: I'm still good on Cell Medals, those are what those silver coins are by the way. If Victor was here, he would be able to make good use of them. I should probably explain what we're dealing with, I almost have all of the Artificial Core Medals back, but I'm still missing Gorilla. Q must still have it, meaning he'll use it to create another Medal Monster.

Kenji: You mean this thing?

Everyone turns to see Kenji holding a black-rimmed silver medal that depicts a gorilla. This of course has his family concerned.

Momo: How long have you had that Kenji?

Kenji: Remember when we went back to assess the damages? I found it on the ground along with all the Cell Medals, I thought it looked cool so I picked it up.

Kenji said but lied as he got the medal from killing an Inves.

Masae: Kenji! What were you thinking?!

Takashi: Son you could have turned into a monster!

Momo: Kenji, why didn't you say anything?!

Kenji's family said very worriedly Kenji just rolled his eyes.

Kenji: I'm fine, I don't think I'd become a monster from a coin.

Isaac: We'll not get a Core Medal at least....

Isaac said which got everyone's attention which Isaac then sighed.

Isaac: Did you think the Greeeds were the only monsters I fought? You see, the Greeeds would approach humans and ask them what they're greatest desire was. This would cause a Coin Slot to appear on the person's head. They would then insert a Cell Medal into the slot and a mummy-like creature would manifest and pop out of the human host's body. That is a Shiro Yummy, the Yummy would then go around devouring its host's desire until it evolved into a Yummy that took on traits of the animals the Greeed that created it is a representative of.

Isaac said which shocked them but understood.

Deku: I see well good thing there is no Greed to make those Yummys so I think we are in the clear right?

Isaac: About that, Completionist Q somehow gave himself the power to create Yummies. While that should be impossible, from what I saw, his Yummies are based on Arthropods. So stuff like centipedes, bees, ants, and spiders as a few examples.

The girls and some of the guys felt dread when he mentioned those bugs.

Pinky: Of course, it had to be the scary ones.

Isaac: If you can believe it they probably won't be the worst thing I've fought.....

Momo: I am afraid to ask what is considered worst when you fight something...

Isaac chuckled a bit when he then got a tap from Deku.

Deku: Okay, besides the monster you fight you have the heroes support plus Momo's parents company. So what should we look out for in case Q shows up?

Isaac: That's where things get tricky, Q is a snake in every sense of the word. He staged attacks on four nations with his Medal Monsters. We didn't even see him in person until he decided to show himself. He's like a ghost when he wants to be

Dynamight: Then how fuck we supposed to be ready when that fucker attacks! He could be already set something up and we would be too late to stop whatever he is doing. The monster would be already on the loose!

Dynamight said which the heroes nodded until Isaac decided to give some insight to the matter.

Isaac: Do you wonder why I got that Candroid? The Gorilla Candroid serves two purposes, throwing things and alerting us when a Yummy appears. The little guy will start spinning his arms and make noise the moment one appears.

Everyone in the room except Compa who knew what the Gorilla Candroid could do were all shocked.

Chargebolt: That little robot can find the Medal Monsters? Wow, that really will come in handy.

Deku: If everyone got a Candroid each we could cover more ground and alert the others.

Red Riot: Yeah! We will be able to intercept the monster and get civilians out but we have to wait for Isaac to get to wherever the monster is. Well, that's the only downfall so I think we got a plan.

Red Riot said which everyone then agreed and Isaac went back outside to get more Candroids and gave all the heroes one.

Isaac: Don't worry, I don't plan on wasting time, so you can bet I'll be one of the first people on the scene.

The heroes smiled and nodded.

Takashi: Well with that being said I think it is best to rest. All of you need your strength if you plan to face the monsters Q sends to our home so everyone please rest and stay safe.

All the heroes nodded and then headed out of the mansion except for Froppy as she had something to say to Kenji.

Froppy: So you're taking him back to Helheim?

Kenji: Probably when we get a free moment, honestly what are the odds another Kamen Rider ends up in our world? This better not become a recurring thing.....

Froppy just shrugs her shoulder and leaves the mansion.

Katashi: Well since everyone left let my butlers and maids prepare the guest bedrooms. I will be heading off to bed as well.

Masae: So will I also Isaac please keep our daughter and son safe when those monsters appear.

Momo: Mom I will be fine Isaac has it covered so no need to worry for my safety Kenji is the one who needs more protection than I do.

Kenji: If only you knew......

Kenji whispered which everyone then headed to bed.

Tokyo Sky Egg

Over in Tokyo, there was a building high in the sky called the Tokyo Sky Egg which is used mainly as an auditorium for various shows and spectacles.

Right now the Tokyo Sky Egg is holding an art competition showing various paintings of heroes, scenery, and etc.

So far people were enjoying the event and having a good time. Over inside the Sky Egg, we see Daisuke helping out at the event by getting the competition ready.

Daisuke: Okay, I need someone to help with the banner.

Daisuke ordered around the other charity workers to which they nodded and started doing what he told them. Daisuke smiled as this event was not only showing art but also helping raise money for orphanages and quirk support groups that help people whose quirks make it hard for them to have normal lives.

Daisuke: Okay, things are going smoothly and the competition will be starting soon.

Daisuke said and then went back to helping around the other charity workers in the Sky Egg. Unfortunately for Daisuke, things were about to get drastic as Q was seen inside the Sky Egg with the hood of his jacket obscuring his mask.

Q: Now then, who would be a good candidate to spawn my player from?

Q then looks around and then sees a woman who looks nervous.

Q: Well now, it seems a perfect candidate has appeared.....

Q then walks over to the nervous woman and asks her a question.

Q: What is your one true desire?

Nervous Woman: I want to be the best artist in all of Tokyo but it seems like I have competition for that title. I wish the paintings the other artist had were gone so my painting could win.

The nervous man said as a coin slot appeared on his forehead. Q pulled out a Cell Medal before inserting it into the slot. A grey-skinned mummy like creature popped out of the man's body before it stood up and looked around.

Nervous Woman: What the heck is that!

The nervous woman asked, very afraid, which Q simply chuckled.

Q: That is what will make your desire come true, now please sit back and let it begin the game.

The Shiro Yummy then grabbed a painting off the wall before it started to devour it like food.

Q: Good, now we just need to wait for it to evolve.

While the Shiro Yummy was eating the painting the competition had started and right now the art director was seen ready to announce that the competition had commenced.

Art Director: Greetings people of Japan it is an honor for all of you to come to this glorious day as artists from Tokyo create fantastic art. Now before I judge who the winner is I would like to thank everyone of you for helping and supporting this art competition as the funds raised would be sent to the orphanages of Japan and as well as Quirk Support groups.

The art director said and everyone clapped and cheered. Daisuke was seen back in the crowd and smiling as the event was going smoothly.

Art Director: Now without further ado let the Tokyo Art Competition be-

Before the art director could say anything everyone heard a loud scream and turned to the noise and saw the Shiro Yummy eating the paintings. It's body was then enveloped in Cell Medals before it's appearance changed to that of a feminine humanoid spider.

The people look at the Archnia Yummy and scream when the sounds of emergency alarm goes off causing the Sky egg to stop and emergency exit to appear and everyone starts running towards them, only for them to be wrapped up in silk cocoons.

Daisuke: Of all the days of an attack happening it had to be at a fucking charity event!

Daisuke said angry as the art competition was stopped by what he assumed was an Inves. Daisuke finally found somewhere to hide and pulled out the Sengoku Driver and Matsubokkuri Lockseed.

Daisuke: That thing is so getting it!

Daisuke then puts on the Sengoku driver and then activates the Matsubokkuri Lockseed.

Matsubokkuri Lockseed: Matsubokkuri!

Daisuke then plugs the Matsubokkuri Lockseed in the Sengoku Driver and locks it in.

Sengoku Driver: Lock on!

Daisuke: Henshin!

Daisuke then uses the blade to slice down on the Sengoku driver to change into Kamen Rider Kurokage and goes after the supposed Inves. Once Kurokage found the Archnia Yummy he used the pole-arm like a javelin and used it to pole vault himself into the air and then struck it across its chest, sending it to the ground causing cell medals to come out of it.

Kurokage: You have some nerve showing up here!

Kurokage said angrily at the Archnia Yummy which got back up and looked at him very angry. The Archnia Yummy then fired strands of silk from the spider legs on her back. The silk wrapped around Kurokage's pole-arm before the silk ripped it out of the Kamen Rider's hands and stuck it to the ceiling.

Kurokage: Son of a-

Kurokage did not get to finish as the Archnia Yummy grabbed him by the throat before spraying a cloud of paralyzing agent that temporarily paralyzed Kurokage. The Archnia Yummy then wrapped him up in a silk cocoon only leaving his head uncovered. The Archnia Yummy then kicked Kurokage into the corner of the room.

Kurokage: Bitch.....

Kurokage said as his pride was hurt as well as being humiliated and kicked around like a rag doll for the third time.

Kurokage: God I hope Baron gets here before the heroes...

Little did Kurokage know that was not going to happen as Creati, Froppy, Chargebolt were at the scene.

Chargebolt: Holy crap so that's what a Yummy looks like. Also, does everyone see the armor guy in the cocoon?

Creati: I see him Chargebolt. Also, that Yummy looks terrifying. It's a spider!

Froppy: We better stay out of line of fire if we don't want to end up like that Armored guy.

Kurokage: I can hear you know!

Kurokage said as he had enough embarrassment for one day which Isaac then appeared.

Isaac: Would you relax, rookie? It's obviously apparent you're still new to this whole thing. Why don't you let someone with more experience handle this?

Kurokage looks at Isaac confused until he sees him pull out the OOO Driver before strapping it to his waist. Isaac then pulls out 3 Core Medals before inserting them into the Driver. Isaac then takes the O Scanner off his hip before scanning the medals with it.

OOO Driver: Shachi! Gorilla! Tako!

Medals spun around Isaac before a symbol appeared in front of him before slamming onto his chest. OOO helmet was blue and themed after an orca. His arms had large silver gauntlets on them that were themed after a gorilla, and his legs were blue and themed after an octopus.

Kurokage just looked at OOO in shock and was silent until he heard a dimensional zipper open and rolled his body to see elementary Inves appear by the dozens.

Kurokage: Oh shit! Hey get me out of here so I can help get rid of these Inves!

Kurokage said, trying to get out of the cocoon.

OOO: How would you be able to help? Your weapon is stuck on the ceiling? So the spider brought friends? Let's see if they can handle this!

OOO pointed both his arms at the Elementary Inves as a jet of water was launched at them. The Inves were knocked over by the water or slipped on the now wet floor.

Chargebolt: Allow me to help.

Chargebolt then points his disck launcher at the Inves and fires four disks and points his finger like a gun and electricity flies out and hits the disk causing some of the Inves to be electrocuted and explode.

Chargebolt: Got some!

Froppy: There are still more of them.

Creati: OOO will handle these monsters while you handle the Yummy!

OOO: Alright, but first....

OOO turned to Kurokage before punching the cocoon. He was trapped inside. The force of the punch caused the silk to explode into small strands. Kurokage then stands up and pulls out the Matsubokkuri Lockseed making his armor and weapon disappear.

Sengoku Driver: Lock off!

Kurokage then pulls at the Kurumi Lockseed and slices it.

Sengoku Driver: Kurumi Arms! Mr. Knuckleman!

Kurokage changed into Knuckle and got into a boxing stance.

Knuckle: Okay, this form might help.

OOO: Just help fight the bugs Rookie, I'll handle the Yummy.

Knuckle nodded before asking OOO a question.

Knuckle: So care to tell me who you are? Yo a pro hero or something?

OOO: Kamen Rider OOO, look out by the way.

The Archnia Yummy lunges forward at incredible speeds as it tries to strike Knuckle with its spider legs. OOO jumped in front of Knuckle before delivering a powerful punch to the Yummy's chest, sending it flying across the room as Cell Medals spilled out of it. Knuckle then looks at his gauntlets and then at OOO's.

Knuckle: Okay, now I feel more humiliated.

OOO: Don't feel bad, these aren't even at full strength. I'd need to use the Sai and Zou Medals for that.

Knuckle: Medals?

OOO: Behind you......

Knuckle turns around to see more Inves coming their way.

Knuckle: Well shit...

Knuckle then saw that OOO had left while he was talking and was busy fighting the Archnia Yummy.

Knuckle then charges at the Inves with the help of the heroes. Froppy was seen using her tongue with an Inves attached to it making it a wrecking ball. Creati was using a staff to strike at the Inves, sending them flying back. Chargebolt was shocking the Inves with his disk and finally, Knuckles was punching and uppercutting the Inves to the point they exploded.

OOO attempted to punch the Archnia Yummy, but it was too fast to hit. The Archnia Yummy stabbed OOO in the chest with its legs as he stumbled backwards from the attack as sparks flew off his armor.

OOO: Compa! Tatoba!

Compa came in through the door before tossing the three Core Medals to OOO. OOO Quickly swapped out his Medals before scanning the new ones.

OOO Driver: Taka! Tora! Batta! Ta-to-ba! Tatoba, Ta-to-ba!

OOO was now in his default form as he tossed the other Medals back to Compa before jumping towards the Yummy with the Batta legs. OOO kicked the Yummy, creating a small green shockwave on its chest that sent it sliding backwards. The Archnia Yummy hissed before it's silk shot out of all her spider legs, ensnaring the room in silk that made it hard for both OOO and the others to move around safely.

OOO: This is not good.......

The Archnia Yummy lunges towards OOO before striking him across the chest as he is sent sprawling across the ground. The Tora claws unfolded from his gauntlets before he used them to slash at the silk threads surrounding him.

Creati: OOO you okay?

Creati said after striking down an Inves.

OOO: Yeah, this thing is fast! I'm going to need more speed if I want to try and fight it. Compa, Cheetah Medal!

Compa: On it!

Compa tossed OOO another yellow medal that OOO used to replace the Batta Medal with it before scanning the Medals.

OOO Driver: Taka! Tora! Cheetah!

Medals spun around OOO as his leg armor changed into a yellow cheetah themed leg armor as he got into a running stance.

OOO ran forward at speeds that made him appear as a blur before he slashed the Archnia Yummy across the chest as Cell Medals spilled out of the wound. The Archnia Yummy hissed before moving at speeds slightly faster than OOO before striking him across the chest with her spider legs. OOO stumbled backwards, but retaliated with another claw slash across the chest. OOO then grabs the Yummy by the shoulders before delivering rapid fire kicks to the side of the Yummy's torso with his right legs, causing more Cell Medals to spill out.

Over with the heroes and Knuckle they were seen taking out the rest of the Inves.

Knuckle: Oi! All of them are almost gone. We need to finish this now!

Knuckle said which the heroes nodded. Creati summoned a cannon which she aimed at Inves and fired followed by Chargebolt with him firing some disks and then Froppy using her tongue grabbing as many Inves as she could and throwing them at the other Inves.

Knuckle then grabs the sword of the Sengoku Driver and performs 3 slices.

Sengoku Driver: Kurumi Sparking!

Knuckle then fires off four walnut energy punches at the Inves which, combined with all the heroes' attacks, causes a huge explosion destroying all the Inves.

Knuckle: Okay, the Inves are gone.

Chargebolt: Hell yeah!

Creati: Okay, with the monster gone we can help OOO.

Froppy: I don't think he needs it.

Froppy said as she pointed to where OOO was seen getting knocked through the door to another exhibit of the art show as Compa quickly ran into the room before the Yummy followed.

Chargebolt: Well looks like you were wrong there Froppy.

Chargebolt said he saw Knuckle was gone and then turned to see he was going after OOO.

Chargebolt: Hey, wait for us!

Chargebolt said as he started running, Froppy and Creati did the same and headed to the same room.

Ice Sculpture Exhibit

Over at the other room where the sign said Ice sculpture exhibit, OOO was seen fighting the Archnia Yummy.

OOO: Compa! Lion Medal!

Compa: Right!

Compa removed a third yellow Core Medal from the O Medal Holder before tossing it to OOO, who caught it before being kicked in the chest by the Archnia Yummy. The Heroes and Knuckle ran into the room as OOO swapped the Taka Medal with the Lion Medal.

Knuckle: Yo, OOO we finished off the Inves.

Chargebolt: And we come to help.

Creati: You okay OOO?

Froppy: Guys incoming!

Froppy said as the Archnia Yummy shot webs at them which all of them dodge.

Compa: I would recommend covering your eyes.

Unfortunately for Compa, Knuckle and the heroes did not hear her warning as OOO scanned the Core Medals in his Driver before holding it up to his chest.

OOO Driver: Lion! Tora! Cheetah! La-ta La-ta, La-tora~~tah!

OOO Helmet changed into one themed after a Lion as the Archnia Yummy lunges at him.

OOO: RRRRRRRAAAAAAAHHHHHH!!!!!!

OOO roared as a blinding light erupted around him that also radiated unbelievably intense heat that melted all the ice sculptures and turned them into steam. The heat damaged the Archnia Yummy and blinded it as Cell Medals spilled out of its body. The steam cleared revealing OOO form to everyone.

Knuckle: Holy shit! He melted all of the ice and turned it into steam!

Creati: So he went with the Latorartah Combo.

Chargebolt: That form looks awesome!

Froppy: Yeah, but it feels like a sauna in here, ribbit.

Froppy said as the room felt quite warm.

The heroes and Knuckle then see OOO crouch into a readied stance as the Tora claws unfolded from his gauntlets. OOO lunges forward as he moves at speeds that were even faster than before he used the full combo. It was difficult to keep up with him, but the Kamen Rider slashed the Archnia Yummy across the chest before stopping and running back and slashing it from behind.

Chargebolt: Damn, he is fast!

Knuckle: His speed is on a whole other level!

The Archnia Yummy screeched in rage as she shot her threads all throughout the room, but it didn't work. OOO out ran them before delivering an upwards slash that sent the Yummy flying backwards. OOO ran to the left before striking the Yummy from the side, then running and striking it from the right. OOO then positioned himself before jumping and delivering multiple high speed kicks to the Yummy as it was sent sprawling across the ground as Cell Medals spilled out of it.

Creati: My word OOO is taking down that Yummy like it's nothing.

Froppy: OOO really is amazing, ribbit.

OOO Then grabbed the scanner off his hip before scanning the Medals once again.

OOO Driver: Scanning Charge!!!

Three yellow rings appeared between OOO and the Archnia Yummy. OOO ran forward going through the first ring. As he passed through each ring, his speed increased further. OOO ran through the third as he raised both his Tora claws.

OOO: Seiya!!!!

OOO delivered a powerful X shaped slash with his Tora claws that caused the Yummy to explode into Cell Medals.

Chargebolt: He did it!

Froppy: Way to go OOO!

Creati: That was amazing OOO.

Knuckle: Holy shit that was intense!

OOO let out a sigh of relief as he relaxed his posture before turning to the Heroes and Knuckle.

OOO: Threat eliminated, we should probably head back and get some rest before another attack occurs.

The heores nodded and then turn to Knuckle.

Knuckle: Are you guys really going to take me in?

Creati: We would but after the fight with those monsters.

Knuckle corrected Creati.

Knuckle: Inve those things we destroyed are Inves.

Chargebolt: Okay, got it now, get out of here.

Froppy: Unless you want to be caught?

Knuckle didn't have to be told to leave but before he did he turned to OOO.

Knuckle: So Kamen Rider OOO huh? Well, can't wait to tell the others about you.

OOO: I wouldn't bother rookie, I know Kouta and I'm pretty sure I've met another one of you already.

Knuckle looked at OOO surprised he knew Kouta.

Knuckle: Got it well see ya, OOO.

Knuckle then used the Gate Lockseed and left the Sky egg.

OOO: We should head out as well.

The Heroes and Compa nodded and they left the Sky Egg and went back to Creati's place.

Helheim

When Knuckle got back to Helheim he saw Kouta was already waiting for him.

Kouta: So it seems like you met my old friend, Isaac?

Knuckle then takes off the Kurumi Lockseed and turns back into Daisuke which he nodded.

Daisuke: Yeah, I met him and I also fought something called a Yummy. Do you know anything about them?

Kenji: They're monsters Greeeds create from the desire of humans.

Kenji appeared before Kouta and Daisuke.

Daisuke: What the hell is a Greeed?

Kouta: Sorry, can't help you there Isaac is the only one that knows. Also, I felt some strange energy at the Sky Egg which then vanished instantly. The energy was strange but also felt rather disturbing.

Kenji: Isaac mentioned that the person that created the Artificial Core Medals is here as well, it might've been him considering a Yummy appeared. If that's the case, he's working with whoever has been distributing the Helheim Fruit.

Kouta: I see this seems troublesome. Kenji, I need you to bring Isaac back to Helheim so I may talk to him on a way we can take care of this person. Also, I think we need more help so Kenji please have an open mind but we all need to work together with the pro heroes for this one.

When Kouta said that Kenji looked at him surprised and also a bit angry.

Kenji: Easy for you to say when there's no risk to you. Do you know what happens if I get caught?!

Kouta: Kenji I know the risks of you having your identity exposed to your sister and family but we are put in a difficult decision. I wouldn't ask for the Pro Heroes help if it was not a last resort and right now it is.

Kouta said as with a new threat involved to their world they were going to need all the help they can get.

Daisuke: So we are going to team up with the Pro Heroes? I say that is a really risky move but how I got my ass whooped and then used like a rag doll today. I think it is warranted that we work with them, Kenji.

Kenji: Fine, but I'll be the one approaching them. I don't trust Charity Case or Four Eyes enough to pull off a negotiation like that.

Daisuke: I agree on that fuck I was lucky enough to be let go by them after they help clear the Inves away.

Kenji: It will have to wait unfortunately, my parents are trying to get me to sit down with them and a few of the Pro Heroes to talk about my designs. Maybe I could pull Four Eyes in on this one, he's good at all that building and repairing technology.

Kouta: Just get Isaac to Helheim when you can anyway I will now send you all back home after today we need to rest.

Kouta said which Kenji and Daisuke nodded. Kouta then uses the dimensional zipper to send them home and leave Helheim. Once both Kenji and Daisuke were gone, Kouta then started walking off.

END

KLigers98: Okay, wow things were hectic also damn OOO was really taking care of business also these Yummys are really going to be a freaking problem hopefully things will work out in the end. Anyway, do you have anything to say, buddy?

Tojamaru: Isaac is a great resource for both the Armored Riders and Professional Heroes in a fight against Completionist Q and the Yummies. Unfortunately Kenji has the daunting task of approaching the Pro Heroes as Baron and trying and work out at least a temporary truce to handle this threat. Hopefully, he will be able to pull this off with little trouble.

KLigers98: Kenji can pull it off so no fretting plus this is going to be interesting. Kamen Riders working together again. Pro Heroes working with the Armored Riders yeah things are really picking up. With that said thanks for reading this crossover of My Hero Vigilantes: Return of the Armored riders and Hyperdimension Neptunia: The Core of Desire. Like, comment, and follow for both stories for more chapters. Ligers signing off.

Tojamaru: Until our paths cross again everyone!