Because they both married late, the couple Sei and wife Reiko have a good relationship. Sei often invites his colleagues Ooki and Kudo to his house for drinks, boasting about his beautiful wife Reiko. One day, as usual, while drinking with his colleagues, Sei passes out drunk. Suddenly, Ooki ties up Reiko with rope and rapes her right next to Sei. After that, whenever Sei is away, Ooki comes over to tie up and torment Reiko. Furthermore, he invites Kudo over, waiting for Sei to return home together with Reiko in a lewd state…
