Office lady Shoko is set to marry her fiancé and leave her job next week. A serious and kind woman, she has always had a hidden weakness—she's unable to resist molestation and loses control of herself when assaulted. One day, she's blackmailed by her ex-boyfriend and reluctantly submits to his demands. From that moment on, he begins stalking her daily commute, molesting and raping her openly on the company bus without regard for others. The abuse escalates as she's gang-raped in front of passengers, and even when the bus returns to the depot, the violent group assault continues. The film depicts Shoko's gradual breakdown as she loses all self-control, surrendering completely against her will.