At a quiet hot spring inn, married woman Rei Yuki (42) relaxes in a soothing cypress bath. With her husband frequently working late on business entertainment and her college-student son growing increasingly dependent on her, she feels lonely during his absences. Recently let go from her temporary job, she finds herself with too much free time. Reflecting on her life, she grows weary of years spent marrying young and raising a child, longing to rediscover the joy of being a woman once more. Seeking fulfillment, she embarks on an affair, spending a night at the hot spring resort where she rediscovers emotional and physical sensation in a man's warm embrace.