Mai, who entered the family as a second wife, was living happily, but her only worry was that she couldn't get along with her stepson, Fuuta. It's hard to be the mother of an adolescent boy. She was prepared for it, but she never expected that she wouldn't even be able to have a conversation with him... One day, Mai, troubled by this, takes a shocking action to close the gap. The best way to get closer to him is to be naked together. Thinking this, Mai bursts into the bathroom naked while Fuuta is taking a bath. However, this action causes Fuuta's hidden forbidden desire to run wild...