During her school days, Nono Mizusawa was always an inconspicuous presence. However, she was manipulated by her homeroom teacher, who used a university recommendation as bait and ultimately took her virginity. That traumatic experience left a deep scar on her life. This past spring, she returned to her alma mater and came face to face once again with her former teacher. When asked why she chose to become a teacher, Mizusawa answered with a single word—“Revenge.” That resolve marks the beginning of a new story.