A year has passed since the death of her husband, and with her daughter Miku married and living independently, Hitomi finds solace only in occasional visits from her son-in-law, Daichi. Their conversations become her few remaining joys, offering a fragile hope in her quiet daily life. Yet Hitomi gradually begins to see Daichi not just as her daughter's husband, but as a man, and she can no longer suppress the growing desire within her. Their relationship crosses a forbidden line and deepens over time. Daichi's warmth and increasing passion consume her, drawing Hitomi into days filled with pleasure and temptation. But when Miku suddenly returns home and discovers the truth about their affair, a new crisis unfolds.