Newlyweds Hiroshi Endou and his wife Ayaka travel to a hot spring resort with several upperclassmen from their old university circle. That night at the drinking party, Hiroshi discovers the shocking truth his beloved wife Ayaka had been the circle's shared sex toy during their college days and had slept with every man present. Knowing that the body of the woman he just married has been used many times by these men, Hiroshi is overwhelmed with confusion and twisted arousal as the old circle members begin to use Ayaka again during the trip