I read this manga like 5 years ago, but I can't remember the name of it. The guy was super popular, and the girl was just normal. The guy is half Japanese, half something else (European I think). In the first chapter or so the guy kisses the girl for a bet and she decks him in the face. The drawing style is kinds weird and old. I remember the guy gets around A LOT, and the girl really hates him. There is a scene where she calls him to the roof because she finds out his dad and her mom are dating. Please help, the series is completed jsyk.

Kirai sounds a lot like the manga you're looking for. Hope it's the one!

it is THANKS 🙂