This really cute and funny manga is about two teenagers who get into a fake dating relationship to stop the war between their two gang/yakuza families. But they hate each other.

The main character had a pendant given to him as a kid by someone who promised they'd get married one day. He's crushing on a fellow student that is not the rival gang daughter, and little does he know she owns the key to his pendant (and his heart).

Really funny and wholesome!