(At Neo H.Y.D.R.A.'s base, Azuma witnesses the deaths of MetsubouJinrai.NET, and decides to run away, feeling that he might be the next victim.)

Azuma: (in mind) Damn it, this Kamen Rider Dark Primordial is a real monster. How did he turn into those monsters?

(As he leaves the base, he decides to look for Percy, not aware that Beroba is watching him.)

Beroba: (chuckles) Another traitor, huh? I guess I'll have to dispose of you, just like Lance did to those pieces of junk.

(Beroba secretly follows Azuma.)

(Meanwhile, Birthright is seen flying through the city until he sees Azuma running, and then he notices Beroba secretly chasing after him.)

Birthright: (in mind) Do I really have to help him? (thinks for a while) What choice do I have?

(Birthright descends to confront Azuma.)

Birthright: Don't you know it's dangerous to run around without necessary protection?

Azuma: I know you hate me... but I wouldn't be looking for you if it wasn't necessary.

Birthright: If it's about my former mother, forget it.

Azuma: No, it's not about her. She can rot in hell for all I care. And besides, she had a certain Dark Rider to depose of MetsubouJinrai.Net.

Birthright: Who could be this Dark Rider?

Azuma: Kamen Rider Dark Primordial.

Birthright: Dark Primordial?

Azuma: Yep.

Birthright: Damn, I wish Ethan could come here and give me a hand.

????: Such a shame indeed, eh?

(They turn to see Beroba.)

Birthright: (glares) Beroba... the most despicable, manipulative harlot I had the displeasure to meet!

Beroba: (smirks) Percy Howard, the most pathetic child Nancy was unhappy to give birth.

Birthright: Knock, knock. (Beroba gets confused) Am I in some kind of graveyard? Because I found a talking dead body.

(Birthright laughs at the pun he just made, and Beroba feels insulted.)

Beroba: (stern) You will regret this!

LASER RAISE RISER!

(Azuma prepares to transform as well.)

DESIRE DRIVER!

(They insert their respective trinkets.)

BEROBA SET!

SET!

Beroba: Henshin!

Azuma: Henshin!

LASER ON. BEROBA LOADING.

ZOMBIE!

READY, FIGHT!

(They transform into Kamen Riders, and Buffa stands by Birthright's side.)

Buffa: Let's do this!

Birthright: (nods) Right.

(Then they start fighting Beroba, but every time they try to attack her, she counters them.)

Beroba: Foolish humans, did you really think you could stand up to me?

(Suddenly someone shoots her.)

Beroba: Very well, who's the wise guy?

???? 2: I am, you manipulative bitch!

(Beroba turns to see a cyan Kamen Rider.)

???? 2: Gotcha!

Birthright: (gets up) Who are you?

???? 2: Just call me Kamen Rider Gotchard.

Birthright: I'm Kamen Rider Birthright, and this is Kamen Rider Buffa. We're Reiwa Riders.

Gotchard: Well, I guess I'm a Reiwa Rider too. Let's show this cow the power of the Kamen Riders.

(Birthright and Buffa nod as they prepare to finish Beroba.)

Beroba: Grrrr. DON'T TAKE ME LIGHTLY!

FINISH MODE! LASER VICTORY!

(Birthright and Buffa prepare their finishers as well.)

EAGLE KICK!

ZOMBIE STRIKE!

(Gotchard prepares to shoot Beroba. As the combined attacks of Birthright and Buffa collide with hers, Gotchard takes the opportunity to shoot her, giving the duo a chance to finish her off once and for all. She screams in agony as she explodes and is reverted back to normal. She then speaks her last words.)

Beroba: One day... you'll be in the same grave... as me...

Buffa: (scoffs) This misery is only yours to feel, nobody else's.

(Beroba disintegrates as Gotchard leaves. Birthright and Buffa bump fists.)

Birthright: I guess I can trust you now.

(As they leave, two familiar figures come in.)

Primordial: It looks like Birthright finally met the fifth Reiwa Rider.

Rainbow Ranger: Yeah, but we must help him against his mother, who unfortunately is an old acquaintance of ours.

Primordial: Nancy Olsen! Tch, that slut thinks she can love me. I rejected her feeling during my school times.

Rainbow Ranger: So did I.

Primordial: Let's help our new budy.

Rainbow Ranger: For the sake of Megaforce-Verse...

Primordial: And Daikaiju-Verse!

(Then they bump fists and prepare to meet Kamen Rider Birthright as the screen fades out.)

A/N: Kamen Rider Primordial is an OC from KaijuMaster20