On a sweltering summer morning, schoolgirls become targets of a groping gang during their commute. As countless hands grope and molest their bodies, sweat pours from their armpits and necks, while the damp, soiled underwear emits a pungent mix of arousal fluids and urine, filling the train car. Mayuko had secretly reported to a teacher that her classmate was being molested by the groping gang, but when her betrayal is exposed, she becomes the victim of widespread sexual bullying throughout the school. Yet, as the torment continues, her pain gradually transforms into pleasure, and she begins actively seeking out cock on her own.