On her way to school by train, Riho finds herself surrounded and forcibly subjected to lewd acts by a group of molesters. Though she resists fiercely, she's unable to move as her body and genitals are repeatedly groped and tormented. Her desperate struggles are no match for the hard, erect penises pressing against her, and she eventually succumbs to the degrading pleasure, climaxing from the vulgar stimulation. Her fear gradually transforms into arousal, and as she's drenched in the men's creampie ejaculations inside the train, Riho sinks into the depths of pleasure.