Yoko Shinomiya is a female teacher at a state secondary school. She was a plain, unsexy woman—the very picture of dullness. Her marriage to her younger husband, Tetsu, had reached a rut. At the start of the new term, Yoko found herself drawn to a plain-looking pupil named Hiroshi Tanaka. One day, she ordered Hiroshi to stay behind after school. Alone with him in the staff room, Yoko made a move on him...