Five years into her marriage, married woman Yuko hopes to start a family soon. Busy with work, she lives life at full speed. On her daily commute, she faces unexpected molestation on the train, something she's always managed to endure calmly. But one day, a sinister molester quietly approaches her during her usual ride. With his skillful technique, he overwhelms her, drawing out uncontrollable moans she can't suppress. Trapped inside the enclosed train car, this unprecedented experience leaves a deep mark on her psyche. The events of that day begin to ripple through her everyday life in new and unexpected ways.