Yuu, a mother who is very enthusiastic about education, is treating her son with even stricter attitude as he is about to take an entrance exam. However, one day, an adult video is found in her son's room. "I don't want you to watch such vulgar things!"Yuu yells, but her son protests, saying that he is not his mother's tool. Not only that, her son is sexually Kokoro about Yuu's ripe body, and attacks Yuu as if to vent his stress from the restraints he has been under! Overwhelmed by her unexpected rebellion, the mother has a forbidden relationship with her son... And as her son's never-ending sexual counterattacks, the former relationship of master and servant is reversed...