Ryu's husband is a successful businessman, she lives a happy life with her husband and her husband's family. Her husband, Toshio, lost his job due to the restructuring of the company. Although I have been looking for jobs everywhere, I have not been able to get hired by any company so far. Pressure from his father, even being looked down on by his younger brother, made Toshio stressed. The only thing that could help comfort Toshio was to look at his sister-in-law's beautiful body. Toshio often peeked at the sex scenes of his brother and his wife. When his younger brother went on a business trip, the pressure from his father as well as being taught by his own brother made Toshio uncontrollable. In the evening when Ryu was sleeping alone, Toshio forcefully invaded her body. The next morning, when Toshio had calmed down, he realized his mistake, and he apologized and begged Ryu for forgiveness. Thinking that she would never forgive him, and was about to leave, Ryu suddenly grabbed his hand and looked at him with deep eyes. And the two gradually understood each other, they willingly came to each other, and began this wrong relationship...