A story about two mothers and their children. - My son, Tatsuo Takayama, goes to university in Tokyo and lives alone. - Due to renovations, his cousin Yoshio Akiyoshi and his aunt Taeko Akiyoshi moved to the home of their mother Kayoko Takayama. - In other words, he is living at Tatsuo's parents' house. - One day, Tatsuo went back to his hometown as originally planned, but he couldn't help but become sexually aroused by his mother, and as a result of his obscene fantasies, he had sex many times and even creampied her. - At the same time, Yoshio spends his days in agony over the beautiful butt of his mother, Taeko Akiyoshi. - He also witnesses mother-son incest in the Takayama family. - Then, Yoshio tries to come up with an obscene plan for Tatsuo, who comes out of the room after the first shot.