It all started when a drunk Mikako suddenly kissed her husband's older brother who lives with her. Triggered by that, her domestic affair that she hides from her husband continues. However, Mikako is likely to find out about her husband, so she consults her brother-in-law about ending this relationship. However, her brother-in-law filmed her relationship with Mikako on video, and refused to dissolve her relationship with it as a shield.
