Mei no Naisho

Mei Haruna, is an effeminate young boy who was raised by his witch mother as a girl and always thought of himself as female. His mother was the only family he had, so after she died, he transfers to an all-girls high school and the school's dormitory with his familiar Abel. Shortly after arriving at the school, his new friends discover that he is actually male, though this comes as quite a shock to him. Despite him being found the school decides that he can stay at the school. The next day, Mei comes to school with Fuuka his roommate and apologizes and informs the others how he is apparently male...