Shinya, who had been betting on horse racing without his wife's knowledge, hit the jackpot. He went to a high-class soapland with a large sum of money in hand to relieve his daily fatigue...and for some reason, his wife's mother showed up! "M-mom?! What are you doing here?!" "Shinya, why are you here..." Shinya blushed at his mother-in-law's face, which was different from the one he usually saw at home, and exuded a raw, nasty womanly presence. "If you keep it a secret from the family, I'll give you plenty of service." His reason wavers as he is tempted by her soft, white skin. He faces the reality that if he is found out, his family will fall apart, and he throws himself into a moment of pleasure.