A story about two mothers and their children. - My son, Tatsuo Ueshima, goes to university in Tokyo and lives alone. - Due to house renovations, his cousin Masaru Yokoyama and his aunt Saeko Yokoyama moved to the house of his mother Mitsuko Ueshima. - 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, Masaru spends his days forcing his mother, Saeko Yokoyama, to wear obscene clothes. - He also witnesses mother-son incest in the Ueshima family. - Then, when Tatsuo comes out of the room after the first shot, Masaru tries to propose an obscene plan to him...