After giving birth, Rumi moves into her husband's family home to raise her child, living alongside her brothers-in-law. Initially kind and welcoming, the brothers gradually lose their composure as they become obsessed with Rumi's breastfeeding. One afternoon, the younger brother, Minoru, forcefully takes her while milk sprays from her breasts. Awakening to the pleasure, the brothers become addicted to her body and milk, dominating her completely and forcing her to obey their desires. The breast milk meant for her own child becomes a tool for their lust, completely shattering Rumi's life.