Saki and Urea have been best friends since college. Both are now married and living their separate lives as housewives. One day, Saki stays overnight at Urea's house. During their conversation, Urea confides, "My husband's an older man, but he's incredibly horny..." Her words stir something deep inside Saki. She starts thinking about Urea's husband, unable to get him out of her mind. Gradually, Saki becomes consumed by a strange fantasy—of being passionately taken by an older, dominant man. As her sexual frustration grows, an irreversible change begins to awaken within her.