Married to her husband for 15 years, Tomoko's only son, Tomonori, had good friends and she was living a happy life. One day, while driving, Tomoko caused a minor traffic accident. Fortunately, she wasn't injured, but in a panic, she left the scene alone without knowing that it had all been witnessed by her son's classmate… Back home, Tomoko regretted her actions. Then, the doorbell rang…
