Riu Nagata, who is 35 years old and has a husband much older than her, says that she has been enjoying spending time with her husband. However, it seems that she was not satisfied with their nighttime activities. One day, she was told, "You can cheat, but in return, I want you to do the housework properly." She felt complicated, but time passed without incident. However, recently she had a physical relationship with a man she reunited with at a class reunion, and that one mistake ignited her desire to cheat.