Extremely popular mature beauty, Eriko Miura, degrades into a ejaculation toilet for a perverted sex addict! Eriko, a married woman who had to work at a dormitory for manual laborers to repay her missing husband's debts. Initially kind, the dormitory boss, Taro, gradually reveals his beastly nature, commanding Eriko to perform lewd manual labor. Unable to escape, she endures the humiliating physical service in poor conditions. Repeatedly subjected to rough sex with extremely virile men, Eriko gradually succumbs to pleasure.