A story of a certain son. Tatsuo Hagak, who attends a university in the Tokyo metropolitan area and lives alone. For home renovation purposes, his cousin Yasuhiro Sawamura and aunt Reiko Sawamura are staying at his mother Sorami Hagak's house—essentially, Tatsuo's childhood home. Tatsuo was enjoying his student life in the city. Then, for some reason, he returned home to find that he had never noticed before how captivating his mother's beautiful buttocks were. Just a slight movement would make him imagine being in a cowgirl position with her, as it was such a dynamic and alluring female figure…
