Mayuki Ito had an argument with her husband and got angry, so she left home and went to her brother-in-law's house to avoid seeing her husband for a while. To her surprise, after arriving at her brother's house, she saw that he had grown up a lot and his house was big and beautiful, which made her feel more affection for him. It seemed like they had liked each other since some time ago, and then what had to happen, happened...