1) 23-year-old tutor: Studied hard throughout high school, but met a sadistic professor in college who taught her masochistic sex, awakening her to masochism. After graduation, she worked at a cram school, devouring students day after day, but feeling unsatisfied, she frequented orgies and happy bars, realizing her excitement from being watched having sex, leading to her AV debut. 2) 29-year-old manga artist: Attended a liberal arts university, drawing erotic manga scenarios of being raped. After graduation, she apprenticed under a teacher but was subjected to perverted training, becoming aware of her masochistic tendencies. Now independent, she remembers those times, indulging in masturbation daily. To release her restless body, she makes her AV debut.