Reika visits her son Kazuya's lodgings after he moves to Tokyo to continue his studies. However, Kazuya leaves early to work, so she goes out to dinner with her roommates Hatanaka and Kashiwagi... Her motherly nature, kindness, and her tendency to be easily influenced are what makes them want to her, and under the influence of alcohol, they push her down... Unable to resist the pleasure she has not felt in a long time, Reika gives herself over to the pleasure. Kokoro by the young man's irresponsible and violent sex, and before she knows it, she is shaking her hips wildly...