Young wives come to a hot spring inn on a recreational trip organized by their neighborhood association. Their lustful bodies heat up in the open-air bath. Their carnal desires, unsatisfied by their husbands, burn lustfully in the steam! They share a passionate kiss with a man other than their husband. Tongues, lips, saliva, and mucous membranes wriggle and intertwine. It's exciting because it's something they shouldn't do. Secretly committing adultery, heaven on earth, hell of pleasure.