Maru (マル)

After his father died of illness, Kazunari, the eldest of four siblings, went to high school and worked part-time delivering newspapers and doing housework to support his family. One day, his mother was in a traffic accident. Kazunari, a third-year high school student, had been working part-time and doing housework and had never thought about his future... However, after his mother's accident, he discovered what he wanted to do: keirin, and decided to take the plunge.