Looking for a specific isekai

Isekai where a girl reincarnated as a side character in one of her fave books/games (classic lol) and like plans to just live a regular life watching the love of her life irl and stuff.

But like something happens and either she can't control herself and instantly confess to him the second she saw him even though it was technically their first time meeting. Or like she stumbled upon him doing something he wasn't supposed to (I wanna say he was a "delinquent" character) and like out of nervousness she confess (but her confession was real cause she really does like him).

And like I think they have a sort of weird dynamic after that where he basically has her as a lucky and keeps asking why she likes him cause apparently he was depraved of love as a kid and stuff so he doesn't really know how to deal with her honest confessions.