Six months ago, Kotomi gave birth to the long-awaited baby girl, bringing immense joy to her family of her husband and three sons. Having returned to her parents' home to focus on childcare, she finally reunites with her husband and enjoys an intimate, milk-fueled marital relationship. The next day, her second son asks to drink her breast milk, and reluctantly, she begins nursing him. But the desires of boys at that age cannot be satisfied by milk alone, and one by one, her sons become involved. As this secret spreads throughout the family, a new chapter of domestic drama begins.