Mother Reiko deeply loves her son, sharing a bond that transcends ordinary family ties. While she maintains a strict demeanor toward him in front of her husband, carefully concealing her true feelings, she transforms completely when her husband is away. Alone with her son, she becomes an affectionate, tender, and intimately caring mother. She shares meals, baths, and even uses the toilet together with him, assisting in every way while pouring out her love. Her warmth and gentle intimacy gradually capture her son's heart more deeply, blurring the lines between maternal care and forbidden desire.