Mio is a widow who took over the management of a factory from her late husband. With her cold and ruthless personality, she pushed the factory workers to their limits with harsh labor. One day, Mio insults a worker named Hamura for making a fatal mistake. However, this triggers an explosion of anger among the workers, who tie her up and violate her! Despite her resistance, Mio is forced to submit as their "bitch for sexual disposal"...