Kureno Rei, the straight-laced, over-serious president of the student council, is the type of person that treats everybody equally. Day after day, he strives to carry out his duties. Suddenly one day, an evil monster called “Dark Genesis” came flying in from space. His aim is “to obliterate the hero who’s occupying the body of a student in the academy”. In order to protect the students, Rei let himself be possessed by the monster…! And then, showing up in front of Rei’s eyes is Fuwa Minori, a delinquent who had no idea that he’s the hero. Rei wanted to clean up the villain in the most amicable way possible, so he approached Minori and deepened their relationship. However, Minori got attracted by Rei and when Minori confessed to him, Rei’s body changed into a monster’s. The way for him to return to normal is through the hero’s kiss…?!! 堅物生真面目な生徒会長・久礼野怜はどんな生徒にも分け隔てなく接する人格者。 今日も今日とて執務に励んでいると、突然、悪の怪人“ダークジェネシス”が宇宙から飛来する。 狙いは『生徒の身体を乗っ取り、学園内にいる“ヒーロー”を抹殺する』こと。 生徒を守るため、怜は自ら怪人を憑依させる…！ そんな怜の前に現れたのは、ヒーローの自覚がない不良の不破みのり。 悪役史上最も穏便に片を付けたい怜は、みのりに近づき交流を深めていく。 しかし、怜に惹かれたみのりの告白を機に身体が怪人化、 元に戻る鍵はどうやらヒーローとのキスで…!!?