A married woman who received a duplicate key was then creampied in a room where a male student was left alone.

Her husband won't deal with him... Yu is complaining about his female friend at the izakaya, and meets Yuzuru, a student who was drinking from the seat next to him. As they were drunk, the two of them became closer, and Yuu became involved in a relationship with him. Then Yuu gets the spare key to his room from Yuzuru, and he uses the spare key and looks forward to waiting for Yuzuru to get home. When she gets home, Yuzuru's young and active sexual desire is over and over again in her limited time, along with pleasure...