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Gozo, a father-in-law who visits his son and his wife and goes to Tokyo, sees his son's busy schedule and sees the couple's sexlessness. Since I am waiting for the birth of my grandson, I am convinced that it is essential to improve the sexual appeal of my wife. One night, Gozo decides to forcibly form a relationship with his wife. He trained his wife, who was not good at sex, every day and led him to become a captive of lust, but a surprising ending that only his son did not know awaited.