Aya Masuo plays Mari, who takes in her stepbrother's son, Shinya. He is honest and obedient, a stark contrast to Mari's husband, Takashi. While Takashi treats her coldly, Shinya suffers from his father's debt problems, and Mari gently embraces him, empathizing with his pain. For the first time, he experiences warmth, tenderness, and a woman's affection. Their bond deepens naturally, eventually leading to a physical relationship.