Higashiyama Haruto is a 34-year-old Japanese history teacher who combines good looks with an honest and friendly personality. When he has been assigned to Nitaka High School, a school for advanced students, Haruto immediately attracts the attention of his female students. But he has a secret that he cannot tell anyone; he wants to be killed by a beautiful high school girl. Obsessed with such a bizarre desire, Haruto approaches four beautiful girls of different types, Maho, Aoi, Kyoko, and Aika, according to the perfect crime scenario he has devised. Who among the four is the high school girl that Haruto has been longing to be killed by for nine years?