Tatsumi is in love with Mizukawa, the wife of the company president. Because of this, he is unable to concentrate on his work and makes mistakes every day. One day, during overtime work, he is left alone with Mizukawa in the office. When they go drinking at a bar, Tatsumi is even more attracted to Mizukawa's unpretentious appearance. The distance between them closes, and even though he knows it's wrong, he becomes immersed in pleasure. From that day on, they start to desire each other's bodies, but...