It's been several years since my husband made a mistress and stopped coming to my house. Yukari was pouring all of her affection into her son, Shota. However, Shota was completely embarrassed by Yukari's attitude. In fact, Shota was also forced to spend the night with his frustrated mother. One day, Shota reveals a secret to his best friend, Kohei. Then, Kohei also confesses that he continues to have such a relationship with his real mother, Sawako. Then Kohei whispered to Shota. "Let's exchange each other's mothers and have fun."