Yuka has raised her son Kousuke single-handedly. While harboring wicked feelings for her son, who was becoming more and more like her late husband, she was venting her unfulfilled desires within herself. On the other hand, even though Kousuke secretly had affection for her mother that was more than that of a parent and child, he spent his daily life hiding it. However, the night before his marriage, Yuka, who peeked into her masturbation, said, "Because it's the last night to spend with her mother and child..." However, the two people who can't settle with that alone can't stand it and are driven by contraindicated desires...
