Hayami Takurou arrives at St. Alcadia School eager to begin a new chapter in its all-girls dormitory, where the students extend an enthusiastic welcome that matches his highest hopes. The attentive caretaker adds to the welcoming atmosphere, leaving him convinced that his days ahead will be idyllic. Yet the mood shifts when the Morimoto sisters, who hold real power at the institution, take notice of his rare gift and move to bring him under their influence.