After giving birth, Rumi decided to live with her brothers-in-law at her husband's parents' house in order to raise the child. At first, her brothers-in-law welcomed her kindly, but the obscene sight of Rumi breastfeeding her brothers-in-law gradually drove them crazy... One afternoon, she finally gets raped violently by her second son, Minoru, who gushes out his milk. She can't forget Rumi's breast milk and her body, which she once tasted... and even after that, Rumi's weaknesses are held and her brothers-in-law do their bidding. And her breast milk, meant to feed her child, becomes a sex tool for her crazy step-brothers...