Responses
School Days?
On second thought, I guess it's not since you said she "almost" killed both of them if you know what I mean ;-)
No, that's not it. I remember the girlfriend become crazy after she found out about the boyfriend cheating. Thanks for helping~
About a possessive girlfriend, the boyfriend afraid of her and cheated with her bestfriend, in the end she almost killed both of them. The girlfriend was short haired, the bestfriend has long dark hair. It's a little bit ecchi.
Sorry for the lack of information. I read this manga once and it keeps bugging me because I can't remember the title.
Thanks~♡