After losing her husband, Natsumi relies on her brother-in-law to get through each day, raising her son together. One day, her brother-in-law suddenly confesses: "I can't forget how you looked in your mourning dress at the funeral... Will you wear it for me again?" Reluctantly, Natsumi changes into the black funeral attire. Seeing her in it, he can no longer restrain himself and impulsively pins her down. Quietly watching the scene unfold, what will her son do next?