I'm looking for a manga, I forgot the name of it.?

I remember reading a manga one time. It was about a girl named Rei and she was involved in a murder when she was younger. She forgot all of her past I think, and went to a school where she had memories or something. Anyway, there are other people with her and she tries to figure out her past and this whole murder thing... And there is this one guy who has bandages on his head. And I remember him hitting his head on gl in one scene. I read it on MangaFox but I can't seem to find it again.