(After killing Ojiro, Toru and Princess Fragrance, the heroes enter Hawkmoth's mansion in order to stop his plans.)

Ms. Marvel: So? Who's next?

Vincent: It depends. So far, we took ten of Hawkmoth's lackeys. We still got a long way to go, but I assume that a certain pink alien will be pissed for what we did to her boyfriend.

She-Hulk: They won't win anyway.

(Then they proceed further until they see two individuals: Mina Ashido and Reflekta.)

Banjou: Mina...

Rena: And Juleka too...

Vincent: Figured out you would be here, Mina. Considering that we destroyed your precious Stone Man for good.

Mina: And you'll pay for this, you bastard!

Vincent: Now, shall we begin the experiment?

Driver: Taka! Gatling! Best Match!

(Izuku copies Vincent's data again, and and gains a new progrisekey.)

Izuku: Wow!

Progrisekey: Genius!

Driver: Authorise!

Progrisekey: Assault Bullet!

ShotRiser: Overrise!

Progrisekey: Hunt!

ShotRiser: Authorise!

Progrisekey: Revolver!

Zetsumerisekey: Vicarya!

Progrisekeys: Ark-One! Ark Scorpion! Ark Falcon! Ark Dodo!

Drivers: Authorise!

Daigo: Kivat!

Kivat: Yeah! All Right!

Kasumi: Kiva-La!

Kiva-La: Here we go!

Driver: Are you ready?

Riders: Henshin!

B. Driver: Tenkuu no abarenbou! HawkGatling! Yeah!

Zero-One Driver: Progrise! Fullbottle shake shake! BestMatching Build! A genius physicist whose mind surpasses all.

ShotRiser: Shotrise! Ready, go! Assault Wolf! No chance of surviving.

Thousandriver: Perfectrise! When the five horns cross, the golden soldier THOUSER is born. Presented by ZAIA!

ShotRiser: Shotrise! Fighting Jackal! Deciding the fate of a battle like a Valkyrie.

Zero-One Driver: Progrise! Hakai, hametsu, zetsubō, metsubō seyo. Conclusion One.

Z. Driver: Progrise! Ark! Destruction! Ruin! Despair! Extinction! Ark Scorpion! The conclusion after evil climbs the top of the highest mountain of rock.

OOO Driver: Sai! Gorilla! Zou! (Dull thud) Sagohzo... (Drum beat) Sagohzo!

H. Driver: Burnrise! Ark! Arson. Hatred. Despair. Incineration! Ark Falcon! Hellfire is the conclusion for this disgusting world's apocalypse.

(Then they become Kamen Riders, and both Kiva and Kiva-La use their fuestles.)

Kivat: Garulu Saber! Next is Basshaa Magnum! And Dogga Hammer!

Kiva-La: Trytelia Dagger! Next is Syren Rifle! And Mearie Hammer!

(Meanwhile at Doran Castle, Jiro and the others realize that they're being summoned.)

Jiro: I guess we're going to breathe the air of the corrupted world.

(Then the arm monsters come to their respective masters, and they change forms.)

Build: Now I have the winning formula.

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

Vulcan: I feel unbeatable now!

Valkyrie: Violations of LOV spotted. Destroying targets!

Ark Zero-One: There's no one left to stop me. No one.

Horobi: Fight... to protect everyone!

Naki: Naki is here.

Ikazuchi: I'm calling down the Thunder!

Jin: The only ones paying for something are you, for your betrayal.

OOO: Seiya!

(Then Kamen Rider OOO punches Mina in the stomach, and then he rushes at her while Kamen Rider Build flies and starts shooting Reflekta.)

Reflekta: Damn it, stop that!

(Kiva and Kiva-La join OOO in dealing with Mina. OOO blocks her attacks, prompting them to rush in.)

Kiva: Hajime, move.

(OOO jumps out of the way, and both Kiva and Kiva-La send a barrage of punches at Mina, and then they uppercut her, prompting Vulcan and Valkyrie to shoot her legs. Mina falls into the ground and screams in pain.)

Kiva-La: What's the matter?

(Horobi and Zero-One are seen dealing with Reflekta as they coordinate their attacks in perfect sync.)

Ikazuchi: Tsubasa, now!

Jin: Right!

(Jin kicks Reflekta in the back.)

Reflekta: Damn you!

Thouser: Naki.

Naki: Right. Let's go, Thouser.

(Naki and thouser attack Reflekta and greatly damage her.)

Froppy: Ribbit. Shall we?

Ingenium: Yes.

(Both of them rush at Mina.)

Froppy/Ingenium: Eat this!

Froopy: Froppy Hopper!

Ingenium: Engine Boost!

(Then they hit Mina and slam her into the wall.)

Mina: Argh.

Kiva-La: Darling.

Kiva: Right!

(Then Kiva uses his Magnum while Kiva-La uses her rifle. Both fire shots at Mina, rendering her unable to move.)

(Reflekta slowly gets up and dashes at Carapace, but Viperion notices that and attacks her, but she jumps off, only for Scarabella to rush at her and uppercut her, sending her flying in the air.)

Scarabella: You could have been a good heroine, Juleka. But you went down the wrong path of life.

(Landing in the ground, Reflekta gets up and rushes at Scarabella, who smirks. As Reflekta gets closer, Pony shoots a barrage of horn cannons at her.)

Scarabella: Pony, heads up.

Pony: Huh?

(Reflekta is seen charging at her, and then Monoma copies Itsuka's Quirk, and both start punching Reflekta towards each other.)

Tetsutetsu: Holy shit, I don't wanna be her right now.

Reiko: I know, right?

(Mina, who somehow survived the shooting, gets up and sees Tokoyami and Mei charging at her.)

Mina: Damn Traitors!

(Mina tries to attack them, but Mirio and Nejire block her attacks before pushing her back, and then she sees Reflekta down in the ground completely disfigured.)

Mina: Holy shit, you're all ruthless.

Build: We're only doing what must be done. Now your time is up.

H. Gaitlinger: 10! 20! 30! 40! 50! 60! 70! 80! 90! 100! Full Bullet!

(Then Kamen Rider Build shoots Mina down, killing her.)

Build: Wanna finish Reflekta off, Tsubasa?

Jin: Hell yeah.

H. Driver: Hellfire Disaster!

(Jin summons a green and black double edge serrated sword. It creates sickly green and jet black flames that Jin uses to summon a storm of fiery slash, killing Reflekta. Then the riders undo their transformations.)

Vincent: Let's get moving.

Izuku: It will be harder and harder as we proceed.

Banjou: Indeed, but we're ready to deal with whoever comes in our way.

Skylar: That's right. We will save the world from Hawkmoth and his new allies.

(Then they proceed as the screen fades out.)