After divorcing her husband, Chiaki raised her only son Junpei by herself. Now that Junpei has grown up, although he struggles a bit with his studies, Chiaki takes pride in having such an honest son. One day, Chiaki found a test answer sheet marked '12 points' in Junpei's trash can. She immediately confronted him, but a minor remark escalated into a full-blown argument. A week later... the two still weren't speaking to each other.
