Satsuki teaches ancient writings at a certain school. Satsuki should have paid close attention to her student's classes when she was around her age, but she felt that one of her students, Yamauchi, was in love with her. One day, Satsuki gives her Yamauchi to her home because of her enthusiasm to teach her to study. There she confesses her love for her and crosses her line with her promise not to tell anyone. However, later on, Satsuki comes to know the size of the price of her act.
