Misa is a middle school teacher. She is beautiful and has a good reputation, but for some reason she has no luck with men. Every night, she masturbates on the train to work, fantasizing about being attacked by a bunch of perverts. One day, her fantasy becomes reality. Misa encounters a group of perverts on a crowded train and is surrounded by them. When she was too terrified to speak out, a man who looked like a businessman asked her, “Are you all right? He managed to save Misa from the trouble. Misa manages to escape thanks to him. The man calls himself Yamamoto, and she falls in love with him at first sight. She later starts dating him, but in fact Yamamoto is also a member of a group of molesters.

From the outside, Yuriko appears to be living a happy life. However, her husband is away on a business trip, and what's more, he seems to be having an affair with her secretary. And although he's her step-son, he's a completely grown man, and she lives alone with him. Sensing a forbidden desire reflected in her son's gaze towards her, she feels a sense of immorality and guilt, but her ripe body aches mysteriously. Then, Yuriko finds out that a widowed mother and son who live nearby are having a physical relationship. And that night, driven by an uncontrollable ache, she visits her son's bedroom...