Narrator: Tokuro Asahina is the brother of Mikuru Asahina, who helped Robert Napoleon, also known as Kamen Rider Den-O in the battle against Nega Ryan Tennyson and his team of Supervillains. But what led him to return from his own timeline? The only way to find out is to return... right before the beginning!

(Tokuro and Mikuru are seen hiding from some rogue demons.)

Tokuro: Run! RUN!

Mikuru: I'm running, onii-chan!

(They finally get away to a hiding spot, but then they meet an Imagin figure.)

Tokuro: Stay away. Don't get close.

????: Don't be afraid. I'm Deneb, an Imagin.

Tokuro: (confused) Imagin?

Mikuru: What is an Imagin?

Deneb: Imagin were originally beings from the distant future who lost their physical forms due to an event in the past erasing their own time, becoming dependent on the memories of others in order to survive. Look, I can help you guys.

Mikuru: Should we trust him, onii-chan?

Tokuro: I don't know...

(Unfortunately the Rogue Demons arrive at the scene.)

Demon 1: Found you!

Demon 2: Thought you could escape, huh?

Demon 3: (grabs Mikuru) You're coming with us now!

(Tokuro is about to do something, but the Rogue Demons quickly take her away, which pisses him off.)

Tokuro: DAAAAAAMN IIIIIIIIIIT!

Deneb: Stay Calm. I said I can help you, didn't I? I'm offering you these.

(Deneb gives the Zeronos Driver and the Zeronos Cards to Tokuro.)

Deneb: Use these and you can save your sister.

(Tokuro knows that his sister's life is at stake, and decides to pick them up.)

Tokuro: Deneb, right?

(Deneb nods)

Tokuro: I accept!

Deneb: Remember to say "Henshin"!

Tokuro: (nods) Okay.

(Tokuro then prepares to transform.)

Tokuro: Henshin!

ALTAIR FORM!

(Tokuro becomes Kamen Rider Zeronos, and then a thunder crashes into the ground.)

(Meanwhile in the streets, the Rogue Demons are seen taking Mikuru away until they suddenly see Kamen Rider Zeronos standing in their way.)

Demon 1: You're in our way. Move!

(Zeronos attaches the handle to the blade with the tip of the triangle aligned to the blade. The Aura Saber then grows, almost tripling its size.)

Zeronos: Let me say this from the beginning: I am fairly strong!

Demon 2: You... you dare oppose Lord Asmodeus?

Zeronos: Asmodeus? What a joke. Yeah, I'm opposing him!

Demon 3: We will defeat you quickly!

(The third demon shoots, but Zeronos blocks the shots with his ZeroGasher and dodges some of the bullets before deflecting the next one.)

Zeronos: It's a bother to keep dodging! Deneb, come!

(Deneb comes in and kicks the three demons, giving Mikuru the opportunity to hide.)

Zeronos: Thank you very much.

(Zeronos jumps and lands behind the three demons as he slashes their backs.)

Zeronos: You're the ones who'll be quickly defeated!

(Zeronos then slashes the three demons with his ZeroGasher before preparing to finish them.)

FULL CHARGE!

(Tokuro slashes the three demons at once, and they scream in pain as they explode. Zeronos then reverts back to Tokuro, and Mikuru gets shocked as she approaches her brother.)

Mikuru: Onii-chan, that was incredible!

Tokuro: (smiles) I'm glad you're safe, sister.

(Suddenly Tokuro realizes something.)

Tokuro: (in mind) Maybe with this power, I can help and save people from those demons. That's it. I'll fight to save the world!

Narrator: And that's how the story of Tokuro Asahina begins.

(Prologue Ends)