Reiko, who lost her husband and lives with her son Eita, has a relationship while being assisted by her brother-in-law Kosuke. My son also decided to cut off the relationship when he was around the age, but Reiko's body was no longer satisfied without Kosuke, and he continued the relationship. One day, I witnessed an affair between Reiko and Kosuke, a friend of my son who came to my house. Yu uses this as a joke to threaten Reiko. Reiko responds to Yu's innocent and vulgar demands, but Eita finds out about it.
