Toru Kouno is joining a new all-boys school in the middle of the semester. As soon as he arrives, he sees a beautiful girl, who is running from students calling her "Princess". After being led to his classroom by the teacher, he is surprised to receive a warm welcome by all his classmates (who are looking at him in a weird way). The class president, Sakomoto is asked to guide him around the school and he is seated beside a beautiful boy named Shihodani (who looks like a girl)...