What is the title of the manga about a boy who attends a school as a girl I do not knowif it is an all girl school or not and I can't remember why he is there He is pretending to be a girl though?

interesting..... i know about an anime that's the backwards version of that where a "girl" attends a school as a "boy" if that's the one your looking fore its called "Oran high school host club" but if your absolutely sure you didn't accidentally flip the Words "girl" and "boy" around than i have no clue what that anime might be