Kanako Miyamae enrolls into the all-girls school, Ame no Kisaki. On the way to the Girls Dorm she meets a girl named Shidō Mariya with her maid, Shinōji Matsurika. However, Kanako later discovers that Mariya turns out to be a boy. With Kanako's knowledge of the fact that Mariya is a boy, the former roommate of Kanako (Ryūken Ishima) is replaced by none other than Mariya himself.