Sayae (45) is a homemaker entering her 20th year of marriage. So absorbed in raising her children, she suddenly realized she was already 45. After her child was born, her relationship with her husband gradually declined, and for over ten years, they haven't been intimate. As the years pass, her confidence as a woman continues to fade. Having worked so hard up until now, she tells herself that just today... just this once. Carrying conflicting emotions of guilt and anticipation, she boards the train, embarking on a journey where her beautiful body is praised and obsessively caressed, gradually freeing both her mind and body.