In the winter mountains of Yatsugatake, amidst the howling cold winds, a forbidden love unfolds between mother Kiriko and her son Hiroaki. Despite her age, Kiriko maintains a voluptuous figure and radiant beauty, while Hiroaki, now an adult, can no longer suppress his growing desire for his mother. Gradually, his longing for her warmth and affection transforms into intense sexual craving. Kiriko, too, continues to spoil her son even as he matures. Their bond begins to transcend the boundaries of mother and child, crossing into uncharted territory and forging a new, intimate connection. As they spend time together in a secluded cottage, their mutual desire becomes unbearable. Overwhelmed by lust and guilt, they surrender to each other, intertwining their bodies. Set against the snowy landscape, this poignant tale captures the deep, sorrowful love and raw passion between mother and son.