KO One: From the Start, I'm Kamen Rider Decade, and My Fiancée Is Lei Ting

Yang Qianyu transmigrates into the world of KO One 3.

A warning he gave as a child saves the daughter of Lei Ting's grandfather, Pang Tianqi.

Grateful beyond words, Pang Tianqi treats him like his own and arranges a childhood engagement between him and Lei Ting.

On the night of his eighteenth birthday dinner,

Yang Qianyu develops the Decade System, with a combat power index exceeding ten thousand, rivaling the ultimate fighters.

And on that very day,

Pang Tianqi tells Yang Qianyu to return and fulfill his engagement to Lei Ting.

Lei Ting: I could never accept a normie.

KO One: Exactly. A normie thinks he can be the King's fiancé? Who do you think you are?

Yang Qianyu: Okay.