A man in a kimono slaps the butt of a high school girl who was smoking on the train and yells, "I'm sorry!" He, Akutsubuji, is a Japanese history teacher who has been assigned to a high school attached to the University of Tsukushi. Yurie, the leader of the Kiyurikai, who was embarrassed on the train, tries to prevent Akutsu from going to school, but...!?