Magical Change Yuuki-kun

Yuki looks girlish. He is also sensitive and delicate, so he is treated as a girl at school. One day, when he is outside, something hard strikes him and he loses consciousness. When he wakes up, he finds himself lying in a sick-room.... He has become a girl! A doll-like girl suddenly appears in front of him. It seems he'll need to follow her orders to get back to a boy....