A man named 'Ryo' works as a site supervisor at a small construction company in Tokyo. He married a younger woman named 'Mizuki' who worked at the same place a year ago. They are not wealthy but live happily without any inconveniences. However, 'Mizuki' is not particularly fond of sex, and due to the lack of nightlife, 'Ryo' accepts an invitation from a man named 'Nakata,' whom he met on a certain site, to join a gathering called the 'Wife Offering Circle.' It was a perverted circle where members exchanged their wives. One day, 'Ryo' is pressured by 'Nakata.' 'You slept with my wife, so now it's your turn to offer yours!'
