A story is set in a school where the student council president, Yukimura Yukari, hears rumors about suspicious activities happening on school grounds after hours. While patrolling, she discovers a questionable tag in an unused classroom, but is stopped by her classmate, Shinomiya Shizuka, from removing it. However, Yukari's junior, Makise Mai, happens to pass by and ends up removing the tag instead. After this incident, strange and erotic events begin to occur at the school. Yukari, who has no means to resolve these issues through force, is suggested by Shizuka to use her minor psychic abilities, but all her solutions are erotic in nature. Mai becomes a target of supernatural beings due to her susceptibility to possession.