Reiji is a private detective. One day, he receives a strange offer from a girl: "Please look for... me. True me." At that time, a series of abnormal murder cases occur, and Reiji is also offered the chance to investigate them. Yukari, Reiji's younger sister, attends a girls' high school where two female students have gone missing. Tokio, the school's vice principal, asks Reiji to search for them. Consequently, Reiji receives three offers simultaneously. To gather information, he begins working at the school in disguise and encounters Toko, the girl who previously asked him to find her true self. "Hi, nice to see you again, sir." The killings never stop.... A spiral of tragedy.... What might break through this tragic situation could be a girl's smile....