One day, Aoi and her husband Daichi are suddenly imprisoned by a mysterious man. Also trapped there are Sagawa, a contractor connected to the couple; their neighbor Machida; and Kida, an adult student in Aoi's role-play class. As the five struggle to understand what is happening, a recording announces that they must have sex, and a timer on an electronic display begins counting down. After agonizing over the demand, Aoi and Daichi have sex in front of the other three. They expect to be released, but Sagawa interferes, leaving Aoi alone behind bars...