He has a problem that he can't talk to anyone about. He can't concentrate on his work because he is thinking about Mitani, the wife of the company president. One day, while working overtime, he ends up alone with Mitani in the office. Kokoro is drawn to her unpretentious appearance at a bar he goes to for drinks, and the two of them become closer. They know it's wrong, but they indulge in pleasure. From that day on, they start to desire each other's bodies, but...