On a train, Mao, a big-breasted married woman, is tormented by a despicable molester right in front of her husband. Unable to scream due to fear and shame, she gradually loses herself to the pleasure. Her pussy becomes soaked with arousal, completely possessed by the sensation. From that moment on, Mao is consumed by a craving for molestation, eventually longing to ride that same train again—this time without any panties.