Keiko was riding the train, heading home. However, on her way back, she suddenly found herself targeted by a lewd molester. Overwhelmed by the shock of this first obscene groping, she couldn't even scream. Amid her disgust, a forbidden pleasure began to stir, gradually shaking her emotions. Though her mind screamed "No," her feet unconsciously carried her back to the same time, same station, and same train car. An inexplicable force, beyond reason, had taken hold within her.