Tsubomi gets relentlessly harassed by a group on her usual commute train. They restrain her, tormenting her body and genitals. Despite her desperate resistance, she can't withstand the disgusting stimulation of their erect penises surrounding her, culminating in a spasm of humiliating pleasure. What was once terror gradually transforms into excitement... She ends up drowning in pleasure, absorbing the men's semen inside the train.