On this school trip, nobody is who they seem — or what.

On a school trip the group life spirals into mutual suspicion — and then it starts: the werewolf game to find the possessor. In the bus the Possession Investigator appears. One after another they impersonate and escape — the motion-sick JK, the class bully JK, the popular busty JK. In the mixed group bath, six consecutive possessions. "Girls can come as many times as they want, so I came too much…"