"I'm sorry I lied to you. It wasn't actually a trip for two women." A slender, stylish young wife who volunteered herself and a voluptuous mother of a child are taken on an overnight adulterous getaway to a hot spring inn in the hidden retreat of Kansai. At the open-air bath, the two wives let go of their daily stress and sexual frustrations. As they touch each other's bodies, their amateurish yet lustful desires gradually intensify.