Ten years after losing her husband, Noriko has been raising her son Akira alone. With little income, life has been tight. As winter approaches, Akira mentions he'd at least like a sweater, prompting Noriko to start knitting. Seeing his mother's efforts, Akira feels a deep desire to warm her in return. He vows, "I'll warm you up, Mom." A story overflowing with warmth and affection unfolds, leading to intimate moments between mother and son, culminating in creampie-filled encounters.