Hinata, who had a secret relationship with her mentor Yukio during her student days and married him, was living a happy life. However, due to the age difference, she was slightly dissatisfied with the decreasing nightly activities. When she greeted him in her underwear to arouse him, Yukio surprisingly brought home Iioka, one of Hinata's classmates… As soon as Iioka was alone with Hinata, he couldn't hold back and approached her… But this entire setup was orchestrated by Yukio, who harbored a twisted desire to see his wife enjoying being ravaged by another man.
