A story about two mothers and children. Tatsuo Ishibashi, a son who goes to a university in Tokyo and lives alone. Brothers Yohei Yagi and Yasuhiro Yagi and their aunt Azusa Yagi are living with their mother, Yuko Ishibashi, due to the renovation of their house. In other words, he lives in Tatsuo's parents' house. One day, Tatsuo went home with her as originally planned, but he couldn't help but get sexually excited about his mother, leaving her behind and having sexual intercourse many times at the end of obscene delusions. put away. At the same time, Yasuhiro also becomes impatient and has sex with his own mother. Moreover, the sons also witnessed mother-child incest in each other's homes.