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Azusa's son, Koichi, is a sexual monster who only thinks about ejaculating if he has the time. She is worried about her son, who sees even his mother as a sexual object when he loses his sense of reason, but suddenly he remembers his mother's friend, Mary Tachibana, and consults her about her son. The sexual monster battle between Koichi, who has an inexhaustible sexual desire, and Mary, who is willing to pay for sexual treatment, begins now.