Hundred, an evil organization, invades parallel worlds using the Aurora Curtain, either destroying or ruling them. They possess advanced technology allowing them to copy the powers of Kamen Riders, enabling their members to transform into them.
But...
We last left off with the four in Ben's house as he asked the question.
Ben: Are you guys... from an alternative universe?
Then time stops, with only Y/n able to move, looking confused.
Y/n: Huh? (Goes to Ben) Hello? Yo, Aibou, you seeing this? (He turns around to see Iori and the Digimon frozen too) Aibou? Impmon? Commandramon? (Snaps his fingers) Hey! Is this a joke or something? Or maybe Hundred?!
A portal opens up on the ground where Y/n is standing. He looks down, then looks at the reader and pulls out a sign that says "Uh Oh" as he screams and falls into the portal.
Y/N fell down on the ground as two portals appeared and two people fell down three of them groaned in pain and they were confuse.
Y/n's: ow....that hurt...
????: Ugh... Is this another world for me to travel?.
???: Where the hell am I??! Am I fuc- (Scott Pilgrim bleep sound) dead again?! Aw, come on, I just wanted to sleep and this happens?!.
????: No, we aren't dead. We in the white void for some reason and the portal bring us here for some reason.
???: And why am I having déjà vu all of a sudden?.
Y/n: Okay, who are you two?!
???: (Chuckle before smirk) I'm just passing through Kamen Rider, remember that.
???: Hey! I was Gonna say that!.
???: Really? To me, I haven't see you around in my world and other Rider world that I meet other Riders like you.
Y/n: Same, but are you guys working for Hundred?! I haven't seen the two of you before...
????: Hundred? I know them but I'm not, I was destroy them to stop them.
???: I've heard of them, but I haven't had a chance to fight them yet.
Y/n: Can you tell me who are you two?
????: I'm Y/N Kadoya but you can call me Kamen Rider Decade the destroyer of world.
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Y/n Kadoya, The Reincarnation of Destroyer of World and The MC of The Trio of Manace! A.k.a Kamen Rider Decade!.
Y/n: EH?! You are Decade?!.
Y/n Amamiya: No way! You are a real!
???: HUH?! Tsukasa, is that you?!
Y/n Kadoya: Tsukasa? How do you know that name? Only Natsumi-san, Onodera-san, and Kaito know that name.
???: Back in my world, you are a fiction character in the TV Show. And I'm have power of every Kamen Riders.
Y/n's Amamiya/Kadoya: What....WHAT?!.
???: Oh I forgot to introduce myself! I'm Y/n L/n from the world of the Owl House and the person wields the power of Kamen Rider, Dark Rider, Psuedo Rider, and Kaijin!.
