Shuuichi Kagaya is a typical high school student, yet he can transform into a monster at times. He has no idea how or why he acquired his talents; all he knows is that he would rather no one knew about them. One night, he discovers a burning building with a girl trapped inside. He changes and carries her to safety after deciding to save her, but he drops his phone in the process. The next day, Claire Aoki, the girl he saved, tracks him down and confronts him with his monstrous identity. She even pushes him over the school roof to establish her notion after Shuuichi disputes her claims. He morphs in order to rescue himself, and Claire takes a picture of him in order to blackmail him into telling her everything.