Yamedomo

You suddenly, really suddenly, realised last night that you were in love with him.

But he and you are just friends(?). Wouldn't confessing to him make things awkward between them? Wouldn't he pretend it never happened? You think like that. And you find that very sad.... So you decided to mess everything up.

That's right, you decided to become a Yandere overnight!

[From itch.io]