Saya and her father lived a peaceful life, but one day their world was shattered. Her father incurred a massive debt of 60 million yen, leaving them with no means of escape. Saya is handed over to a group of men who subject her to brutal torment with their huge cocks, thrust into a nightmarish reality. As their daily life collapses and the bond between family is tested, Saya's mind gradually breaks down. The story portrays the fragility of familial ties, the threat of evil, and human vulnerability.