It started when a drunken Matsuri suddenly kissed her husband's older brother who lives with her. That's why her domestic affair continues behind her husband's back. However, since Matsuri is likely to find out about her husband, she consults with her brother-in-law to end the relationship. However, her brother-in-law has taken a video of her relationship with Matsuri, and uses it as a shield to refuse to dissolve her relationship.
