A salaryman husband who has been married for two years lives with his mother-in-law, Yukari's mother, Yuko. He gratefully accepted her offer to live together until they found a good place. However, since then, the son couldn't stop thinking about Yuko, who had a more voluptuous and mature body than Yukari. One day, the son witnessed Yuko intensely entwined with the neighborhood liquor store owner…
