A certain son's story. Tatsuo Haga, a son who goes to a university in Tokyo and lives alone. Due to the renovation of his house, his cousin Yasuhiro Sawamura and his aunt Reiko Sawamura are living in his mother Sorami Haga's house. In other words, he lives in Tatsuo's parents' house. Tatsuo was enjoying his student life in Tokyo. And when he returns home for some reason, he is fascinated by his mother's beautiful buttocks, which he had never noticed before. It was because he was a dynamic and attractive woman's body prominence to the extent that even if he moved a little, he could imagine a woman on top posture with his mother.
