Mari Morino, who married a man much younger than her, finds her life taking a drastic turn after giving birth when her husband suddenly transforms into a mother-obsessed man demanding breastfeeding play. Feeling uneasy about his strange behavior, Mari confides in her stepson, only to discover that he too becomes aroused by breastfeeding. As a result, Mari's breasts are continuously sought after, thrusting her into a whirlwind of relentless lactation demands.