The husband’s impotence and his disappointment with sex are the reasons why the beautiful wife, Yokoyama, has to find another man to satisfy her own needs. Unfortunately, that man turns out to be her father-in-law. She constantly displays provocative and stimulating behaviors in front of him because she knows that although he is just over 50, he has always had a yearning for sex since his wife passed away, before his ability to engage in sexual relations wanes. Whenever her husband is away, the two of them help each other satisfy their desires, and of course, this happens many times, not just once. It is a pity for the hardworking husband who supports the family while being betrayed by his promiscuous wife and the miserable old father.