Young wives come to a hot spring inn on a recreational trip organized by their neighborhood association. Their lewd bodies heat up in the open-air bath. Their carnal desires, which cannot be satisfied by their husbands, burn lustfully in the steam of the hot springs! They share passionate kisses with men other than their husbands. Tongues, lips, saliva, and mucous membranes wriggle and intertwine. They get excited because it's something they shouldn't do. Secretly committing adultery, a heaven on earth, a hell of pleasure.