Misa Yuuki married into the rural Yuuki family, but after losing her husband, she began living alone with her father-in-law. In this region, a tradition persists where widowed daughters-in-law become sexual slaves to their unmarried male in-laws. One day, news of Misa's remarriage surfaces, prompting her father-in-law to lock her inside the storehouse. Bound by ropes, her days of sexual servitude and debauchery begin.