Two couples, close friends, arrive at a hot spring resort. The husbands are feeling a little restless. That's because this trip is a twisted arrangement where they'll be swapping wives for a night of forbidden fun. The wives, oblivious to this plan, discover the truth and find themselves surprisingly eager to be taken by another man, enthusiastically engaging in sex! It's an NTR hot spring getaway where they end up cheating on each other with each other's wives! Even the innkeeper, who learns of this secret, can't resist joining in on the action, having sex with the guests! This is an abnormal hot spring trip for these perverted couples, filled with non-stop wife-swapping and passionate encounters between the beautiful wives and the innkeeper, both giving and receiving pleasure day and night.