Until recently, the Oukyo Academy was an all-girls school. After it was opened to boys, Takumi Ikenoue became the first and only male student. Unfortunately, Takumi is met with nothing but hostility from his female classmates, even though there has been no misbehaviour on his part. One day, Takumi overhears Chairwoman Alisa Kichijouji and her confidante Yuriko Kuga talking about a mind control device they are currently testing at school. With the help of this device in the form of a music box, they create hostility towards Takumi and later want to enslave him with it. After Takumi has managed to take control of the poorly secured device, it’s time to turn the tables …