Chihaya is a main protagonist who transfers to an all-girl's school from all-boys's school. He became alienated from his father and he distrusts people, especially males. Due to his character and his female looks, a nasty trick was played on him by other students in the all-boys' school and he truanted the school, consequently refusing to go to school. His mother ordered him to enroll to Seiou Girls' Academy.
His surname Kisakinomiya is his mother's maiden name in order to enter into the school. His actual surname is Mikado (御門). Mariya and Mizuho are his cousins. He is acquainted with Mizuho. But he doesn't like Mizuho because he's compared to him who is excellent. His feeling for Mizuho change when he hears episodes of Mizuho's school days.
His grandmother on his mother's side came from Northern Europe and he is gray-haired due to atavism. He behaves himself like a lady perfectly and he is good at studies and sports. He becomes the focus of attention, and he becomes the seventy-fifth elder sisters with Kaoruko.
Reason For Cross-Dressing
Following his mother's decision to join an all-girl's school, he needed to look the part.