(The heroes are seen in Musutafu as they see some house in ruins and other houses in fire.)

Momo: What the hell?

Banjou: I already who who burned those houses...

Tsubasa: Really?

Banjou: Unlike the fake death of my brother Touya, I guess my father didn't take mine well, and started doing what you're seeing.

Kagami: How bad is your father?

Banjou: Think of him as an adult male version of Chloe Burgheois. Except for he has a short temper and does what he does just to try to surpass All Might.

Ochako: I bet both of them joined forces to destroy the city just because they aren't known as heroes anymore.

Izuku: Maybe Stain was right after all.

(Then Skylar detects some malice.)

Skylar: Nino. Use your shell.

(Then someone tries to attack the heroes, but Carapace uses his shell to block the attacks, and then the heroes see the akumatized All Might, Endeavor and Mount Lady.)

Vincent: Figured out you would be next, Toshinori, Enji and Yu.

Zoe: Even the so-called number one and number two heroes turned to Hawkmoth?

Momo: And even joined the League of Villains? Low blow.

Endeavor: Tell me, son. Do you really expect me to forgive you for faking suicide?

All Might: You will pay for ruining our reputation, Todoroki.

Banjou: It's Banjou Fuwa now! And All Might, I used to idolize you. And now, just because of inaccurate information, you are cruel to your own students?!

Izuku: All Might, I used to idolize you too, consider you as a teacher, a father. And now, just because of inaccurate information, you are cruel to your own students? I HATE YOU!

Mt. Lady: (angry) Listen here...

Momo: No, YOU listen. If you weren't so hypocritical to the point of believing in a lie, none of this would ever had happened.

Endeavor: It's true. But I don't regret anything, just like I will not regret taking everything you hold dear, son.

All Might: Same goes to you, Midoriya. I will crush you like a bug this time!

Vincent: Really? Then we'll have to resort to this!

(Vincent then pulls out something.)

Vincent: Now, shall we begin the experiment?

Asuna: Tsubasa, Kagami, Zoe, Let's do this.

Izuku: Skylar, let's combine forces.

Skylar: Right.

(Vincent starts shaking the can, and then he inserts it on his driver.)

B. Driver: RabbitTank Sparkling! (Vincent cranks up his lever.) Are you ready?

(Asuna, Tsubasa, Kagami and Zoe pull out their Massbrain Zetsumerise Keys.)

Zetsumerisekey 1: Massbrain!

Metsuboujinrai D.: Authorise!

Zetsumerisekey 2: Military Horn!

Zetsumerisekey 3: Zetsumetsu Evolution!

Zetsumerisekey 4: Serval Tiger!

Progrisekey: Everybody Jump!

Zero-One D: Authorise!

(Banjou shakes his Muscle Galaxy fullbottle and puts it in the driver.)

B. Driver 2: Muscle Galaxy! (cranks up the lever) Are you ready?

V/S/A/T/K/Z/H/I/B/O/M: Henshin!

B. Driver 1: Shuwatto hajikeru! RabbitTank Sparkling! Yea-Yeah!

Metsuboujinrai D.: Progrise! Connection! (Connection!) Complete! MetsubouJinrai! Quartet with Unified Will!

Thousanddriver: Perfectrise! When the five weapons cross, the jet-black soldier ZAIA is born. I am the president.

Ark Driver: Singurize! Hakai, hametsu, zetsubō, metsubō seyo. Conclusion One.

ShotRiser: Shotrise! Serval Tiger! Blades spun by justice that protects lives.

OOO D.: Ptera! Tricera! Tyranno: (Screech) Pu-To-Tyrannosaurus!

B. Driver 2: (Techno rock music) Ginga muteki no kinniku yarō! Cross-ZEvol! Panēi! Maji panēi!

Zero-One D.: Progrise! Let's rise! Le-Le-Let's rise! Metalrise! Secret material Hiden Metal! MetalCluster Hopper! It's high quality.

(Then they become Kamen Riders, except for Daigo and Kasumi, who become full fangires.)

Build: Now I have the winning formula!

Metsuboujinrai: We will destroy you all!

Zero-One: There's only one who can stop you, and that's me.

Cross-Z: I feel unbeatable now.

Valkyrie: Violations of the LOV spotted. Destroying targets.

Zaia: It's going according to my scenario. 100%, no, 1000%

OOO: Get ready!

Bat F.: Because now we'll show you what we can do to power-hungry people.

Pearlshell F.: Who's the first victim? Perhaps you, Weak Might!

All Might: Who did you call weak?

(All Might charges at the Pearlshell Fangire, who does nothing.)

All Might: Take this, bitch! DETROIT SMASH!

(The Pearlshell Fangire grabs All Might's punch.)

Pearlshell F.: Pathetic. Let me show you an attack.

(Meanwhile, Kamen Rider Ark-One combines with Kamen Rider Zero-One's Metal Cluster Hopper, and then he changes to Metal Cluster Ark Hopper.)

Valkyrie: Izuku?

Zero-One: No, Ochako. It's me, Skylar.

Zaia: So this means...

Metsuboujinrai: Yes, Skylar and Izuku combined into Metal Cluster Ark Hopper.

(While the Pearlshell Fangire fights All Might, Kamen Rider Build and Kamen Rider Cross-Z deal with Endeavor while the Bat Fangire and the rest deals with Mt. Lady.)

Endeavor: You will all die today!

(The fight starts, and the heroes exchange blows with the akumatized former heroes. Kamen Rider Build kicks Endeavor away as Kamen Rider Cross-Z chases after him. Recovering from the kick, Endeavor stops himself before charging at Banjou. Meanwhile, the other heroes land powerful hits on Mt. Lady, who barely gets up.)

Mt. Lady: You have really improved yourselves. But you're still weaklings.

Bat F.: And you're still a pathetic human who cares about fame and power. And another thing, Midnight is stronger than you!

Mt. Lady: HOW DARE YOU?

(Mt. Lady tries to punch the Bat Fangire, but Kamen Rider OOO uses his Putorya Form's tail and pierces her hand.)

Mt. Lady: AAAARRRRRGGGH!

(Back to Build and Cross-Z fighting Endeavor, they're still exchanging blows.)

Endeavor: You got better.

Cross-Z: Agreed, but now it's time to finish this battle.

Endeavor: You can't win, I'm stronger than you both.

Build: The laws of victory have been set!

Endeavor: What?

B. Driver 1: Ready, go! Sparkling Finish!

B. Driver 2: Cross-Z side! Ready, go! Muscle Finish!

Zero-One D.: Metal Ark Rising Impact!

ShotRiser: Serval Tiger! Justice Blast Fever!

Thousanddriver: C.E.O. Destruction!

Metsuboujinrai D.: Massbrain Impact!

OOO D.: Blasting Freezer!

(Then they combine their finishers and finish the akumatized trio before returning to normal. Kasumi, Hajime and Izuku pant due to the use of their dangerous forms.)

Izuku: Well, that was something.

Kasumi: I never knew we could do that.

Hajime: Indeed.

(Then the screen fades out)