Hiroki, a ronin preparing for exams, was living a life dedicated only to masturbation and neglecting his studies. Yukie saw her son like this and couldn't hide her shock at his erect penis, so she helped him with his masturbation under the pretense of sex education. Although Hiroki begged to finish, Yukie ignored him. Seeing her son's disappointment, Yukie reluctantly agreed. Unable to calm down, Hiroki tried to insert himself into Yukie's vagina again, but she escaped and was caught and raped. Since then, Hiroki sought Yukie at any opportunity, and a twisted form of parental love began to emerge…
