My big-breasted sister, a NEET and recluse, has started a shady business at home - Ayane Yoshida

The movie revolves around Niiyama Saya, a young wife whose husband is often away on business trips. She is taken advantage of by a group of individuals who gradually break down her resistance and morals. The story explores themes of exploitation, coercion, and the blurring of boundaries, leading to a complex web of relationships and power dynamics.