I cant remember what was the name of the manga i read? ?

please help me find this mangas name its about this girl who is afraid of guys she went to a school that she though was guy free but then it isnt its just separate buildings and if she goes near a guy she freaks out because of her past, i remember reading the first chapter and it talked about how she doesn't like guys but she is okay with her step dad when she was walking to her clroom she was so scared because there were guy's every where and she kept looking down and a guy called her hunch back or she slouch like a cat but thats all i remember so please help me find the name i tried re-tracing my steps but couldnt find a clue .