Married for 15 years, with her son Tomonori getting along well with his friends, Reiko had been living a peaceful daily life. One day, while driving, she was involved in a minor traffic accident. Fortunately, no one was injured, but Reiko panicked and fled the scene without stopping. Unaware that her son's classmate had witnessed the entire incident, she returned home filled with regret and overwhelming guilt. As she agonized over her actions, the doorbell suddenly rang...