Ishihara has an older husband, who is not handsome but is always faithful to his wife and especially hardworking. It seemed like she was very happy living in such a family, but that was just the tip of the iceberg, as her husband's younger brother had destroyed everything. He forced Ishihara to 'serve' him whenever he needed, and there was a secret between the two, so Ishihara had to obey him. The fear was clearly visible on her sister-in-law's face when standing before that despicable brother-in-law. At the end of the film, Ishihara cried, not knowing when this physical humiliation would end. Perhaps she had to find a way to resolve it, and the best way was to tell her husband about the sinful secret she had been hiding - the one that she had been exploited by her brother-in-law to blackmail her...