(One day after the fight Kaito and Yuki had with Katsuki, they have another class as they keep focusing on the lessons. Some students whisper among themselves, and Kaito knows what they are about, but doesn't mind. Once the class ended, Kaito is seen with Yuki, Mio and Maria as they walk through the streets.)

Kaito: Where are we going?

Yuki: To the Sweet Fang.

Maria: Sweet Fang?

Mio: What is that?

Yuki: (smiles) It's a vibrant and cozy sweet store with an assortment of colorful candies, chocolates, and pastries. The entrance is welcoming, and it has a cheerful, inviting atmosphere.

(Suddenly Kaito sees an old woman about to be run over by a robber's truck.)

Kaito: (eyes widen) Oh no!

(He is about to do something, but something goes past him.)

Kaito: Huh?

(Suddenly the truck is stopped by a skinny looking person.)

Kaito/Mio/Maria: (unison) What the hell?

Yuki: How did he-

(The robbers cough as they get out of the truck. As they are about to try to run away, the skinny looking person stops each one of them and throws them one by one in a nearby trash bin before proceeding to help the old woman up.)

Old Woman: Thank you, young man.

(The skinny looking guy simply nods in agreement as the four get shocked by the seemingly skinny guy's strength.)

Kaito: (in mind) Who is he? What is he?

(He then shrugs as he turns to Yuki.)

Kaito: Where were we?

Yuki: Oh, I guess I remember.

(They walk to the sweet store as the skinny looking guy notices that and takes a shortcut to get in there. The four finally arrive at "Sweet Fang".)

Yuki: Here we are.

(The three get shocked and amazed by the store as Kaito feels some kind of warmth.)

Kaito: (in mind) Yuki was right, this place is sure vibrant.

(As they enter, they see the very strange boy they just saw helping an old woman while stopping the robbers earlier.)

Kaito: (in mind) It's him again? What is he doing here?

????: Welcome to the Sweet Fang. I'm Kiba Igarashi, owner of the store. Want to order something?

Kaito: I want some hot cocoa with marshmallows with chocolate Oreo cake.

Mio: Two chocolate fingers.

Yuki: Hot Cocoa and cookies.

Kiba: (bows) Right away.

(As Kiba walks to the waiters, he looks at Kaito for a brief moment, but quickly regains his composure and calls the waiters.)

Kiba: They want two hot cocoa, one with marshmallows, other without. They also want Chocolate Oreo Cake, Two Chocolate fingers and Cookies.

(The waiters bow and do their best to deliver their orders.)

(Timeskip)

(After eating the sweets, Kaito pays the bill as they leave the Sweet Fang.)

Kaito: I'm not gonna lie. That sweet store's got nutty sweets with excellent flavors.

Yuki: (giggles) I told you so.

(Suddenly they accidentally encounter some monsters.)

Spider Kaijin: My, my, my, look what we have here.

Anemone Kaijin: Four fresh meats.

(Suddenly Katsuki steps up while glaring at Kaito with pure anger, but then something like a crow feather brushed past Katsuki's cheek. The four students turn around and see Kiba, but this time with a green hair.)

Katsuki: Tch, great... another extra. This doesn't involve you!

Kiba?: Ohohoho, looks like we got a bully, and an arrogant one, I see.

Kaito: (in mind) Who is he really? A gangster leader or something?

(Kiba then unzips his coat, revealing a Henshin Belt attached into his stomach.)

(He then pulls out a gochizo, and inserts it on his belt.)

GUMMY!

(He cranks up his belt's lever as the two kaijins charge at him.)

BITE GUMMY!

(Kiba then does his transformation pose.)

Kiba?: Henshin!

(He pushes the button as the gochizo activates, and his transformation starts.)

SPARKINGUMMY! YUMMY!

(Kiba transforms into Kamen Rider Bitter Gavv as the kaijins stagger back.)

Bitter Gavv: I will kill all of the Hero Clan! Even if it's a kid who wants to be a hero!

(He rushes at the kaijins and launches an energy slash at the Spider Kaijin. Anemone tries to bind him with her vines, but he slashes them and kicks her as he prepares to perform his finisher.)

BEAT YOU! SPARKINGUMMY END!

(Bitter Gavv generates pulses of black and red waves with speckled energy. He gathers it towards the right Sparkingummy Alterleg and delivers a spinning side kick of the accumulated energy at the kaijins. They scream in pain as they explode. Bitter Gavv then turns to Katsuki, and approaches him as he tries to use his explosions, but he is clearly unfazed as he grabs Katsuki.)

Bitter Gavv: The next time you hang around here, I'll make you take the corpses of your family... And I'm not just talking...

(He then slams Katsuki into the wall, knocking him unconscious. Kaito gets shocked by such brutality, and before he could ask him, Bitter Gavv passes through the wall.)

(Cut to Kiba, he reverts back to normal and rushes back to his store as he regains his normal personality and goes to the surveillance hub, where he deletes all of the videos related to Bitter Gavv.)

Kiba: Such presence isn't appropriate this time.

(To be continued.)