The main character, Sashihara Yasushi and the heroine, Sashihara Mariko, are married for five years.
During her newlyweds, her wife's infidelity was discovered only once, but it was not a serious matter and they lived a happy married life.
However, the two have been troubled by the fact that their husband and wife have become more and more uneasy recently.
One day, Yasu receives an after-in-law's report from his wife Mariko.
-The other person must be a new employee eight years younger than you, and a virgin boy.
- Being a sportsman who was a long-distance runner when he was a student.
- Being confessed to me after having sex in a love hotel.
Mariko said she wanted to become her husband's official lover.
It was a crazy request, but it was different for Yasu, who has a desire to be cuckolded.
There was intense excitement that I hadn't felt in a long time.
Yasu accepts Mariko's wishes and begins an affair with her husband...