Hitomi Honjo and her husband live in a mansion located in an upscale residential neighborhood. One evening, while doing housework, Hitomi receives an unexpected call from her father. He asks her to take care of her husband's younger brother, who has just been fired from his job. The couple welcomes their brother-in-law, whom they haven't seen since their wedding, but they quickly notice something strange about his behavior and attitude. Then one day, when the husband leaves for work, the brother-in-law makes an unexpected move... A story of family bonds and hidden truths begins to unfold.