Newlyweds Hiroshi Endou and his wife, Ayaka, travel to an onsen with a few upperclassmen from their college circle. But that night, a shocking truth comes to light! Ayaka has had sex with every man in the room, back in their college days! Knowing that his wife's body has been played with many times by these men, Hiroshi becomes possessed by confusion as well as other feelings. "Shall I lend you my wife this evening?"