The bitter ending for the middle-aged man who wants to marry a young wife and get married cannot serve his young wife to satisfaction. Yuu Shinoda was very needy when her husband didn't go to the market often and ran out of money, so she decided to use her husband's stepson to satisfy herself, she constantly seduced her husband's son, and then secretly ate clumsily right behind her husband's back.
The culmination is that the two have sex right next to him when he is sleeping in a lot of positions...