At a quiet inn, married woman Ayano (45) relaxes in a soothing cypress bath. Though she puts on a cheerful face, her lonely gaze betrays the deep emotional emptiness within. Neglected by her busy husband and soon-to-be-married only son, she's reached her physical and emotional breaking point. A casual drive loosens her up, and when she encounters a firm cock in the hot spring bath, her body reacts intensely. When asked what adultery means to her, she replies, "Maybe... it's when someone draws out the hidden side of me?" Her words reveal the deep, suppressed desires buried in her heart.