A single mother, Sayuri, lives in a mountain village and is cleaning the house for her brother-in-law who has arrived from Tokyo. Her mind is unsettled. Five years after her husband's death, she once experienced a forbidden relationship she could never tell anyone about—and the memory still haunts her. Now, as her brother-in-law visits the Nishina household again, bringing life back into the family atmosphere, their intimate connection begins to reawaken. Burdened with guilt, Sayuri's body instinctively responds to his seduction. Beneath her longing lies a deep inner conflict, linking the past to the present.