Yuri Hirai, a female college student, used to photograph everyday scenes with her childhood friend Masato with her hobby camera. One day, information about a party whose sender is unknown arrives at Yuri's home. Although the invitation was a bit dubious, the same thing arrived at Masato, so they decided to join the party with a light feeling. Arriving at the meeting place marked on the guide, there were five men and women of the same generation and one middle-aged man. From there, the eight drive to the party campsite by wagon, where they will be forced to join a party that can never be turned back.