A married woman in her thirties, harboring deep dissatisfaction toward her emotionally distant and indifferent husband, decides to surrender her body to a complete stranger in search of solace. At an outdoor hot spring bath, the two entwine, revealing their true, desire-driven selves. She mounts the man, riding him passionately as she chases pleasure. The next morning, she takes him deep into her mouth at the same onsen, and upon penetration, is rendered speechless. Overcome by arousal, she trembles with goosebumps, writhing in ecstasy. Through this hot spring journey, the married woman's heart and body are profoundly shaken.