Yuko lives an ordinary life, having given birth a few years after marriage and striving to raise her child while enjoying the stability of a home she and her husband purchased together, leading what seemed like a smooth and fulfilling life. Known among neighbors as a devoted wife, she had built a peaceful family life. One day, however, she witnesses her husband arguing with a strange man on her way home. Yuko steps in to mediate, kindly comforting the unfamiliar man—an act that soon spirals into serious trouble. A small incident in her daily routine ends up drastically altering her life in unexpected ways.