Yamato was transferred to a new school due to his personality as a kind but meddling troublemaker. He joined the former girls’ school Seirinkan Academy, which recently became co-ed during reorganization. His classmates were at first perplexed by his transfer midway through the term, but they gradually accepted him after getting to know his good points.

However, there was someone who would not approve of him: the student council president Rio, who greatly hates men. There was a great commotion as many eccentric girls flocked to his side. It also seems that Rio holds a secret which she cannot tell others…