An affair between a married woman and her lover on a hot spring trip. She ties her hair up, and as her yukata sash is undone, her skin is exposed, making her shyly lower her face. Once in the outdoor bath, she forgets her guilt, laughing happily—until a finger slides into her slit, making her voice tremble and her nipples harden. Gazing at the camera, she seductively whispers, "I'm sorry, honey," then pleads to her lover, "Please enter me..." Each thrust into her deep vagina echoes with splashing water, the sound symbolizing their intense, illicit sex.