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Rin visits the house of his father-in-law, Eikichi, who is ill with her husband. That night, Eikichi unexpectedly sees Rin indulging in masturbation ... Eikichi mercilessly caresses his wife in front of his son, thinking about the couple's sexual life and saying, "If you care for me, I'll tell you what sex is!" And my father-in-law's "SEX class" is escalating steadily ...