Pls, help. So many h-mangas, so little i know....

I simply have too many hentai books on pc and i can't find one specific manga. About plot: All i remember is first page where is a flashback about a girl, who's bullied by other kids by calling her "oppai monster" (or something like that). I guess this one's genres are: Vanilla, Osananajimi and paizuri. Can someone tell me a title of this story or which tankoubon can i find this? Thanks for help.

P.S. I know, few posts and all i do is asking for help. I'm doing that, because this forum is a most reliable forum i've ever know :)