After being widowed following her husband's passing, Minori grows closer to her stepsons, the children from her late husband's previous marriage. As the two boys mature into young men who become her emotional support, they begin to feel an undeniable warmth toward her—yet their feelings gradually shift into something beyond mere familial affection. Drawn to Minori's beauty and voluptuous figure, the brothers develop deep, forbidden desires. Amid this charged atmosphere, a strange and intimate bond begins to form between the three, transcending the boundaries of mother and sons, ultimately giving rise to a new, taboo relationship.