Takaki lives a peaceful school life. There is also his cousin, Haruki, at his school. She is a teacher of biology. One day, Haruki tells Takaki and Rei, his classmate, to assist her experiment. However, the experiment fails and Takaki accidentally gets a special power that he can control other's mind. At the same time, an odd group is formed. Nobody knows what they do, but there is a rumor that participants can become happy. Also, participants are all female students. Saori tries to disclose the secret and she meets Takaki along the way.... Accident, necessity, control, compulsion, and....