When Kirisawa Shogo was a high school student, he was a brilliant amateur boxer. He won 4 boxing tournaments and he seemed to have a bright future in the sport. During his university student days, he quit the sport of boxing. Life went on for Kirisawa Shogo. But, after his beloved wife died, his life has now become a total mess. He doesn't have any hope or desire to live. He just spends his days working part-time jobs to make a living. One day, his friend asks him to coach the boxing team at the high school where they attended. Kirisawa Shogo accepts the coaching position. Being around the young boxers, who work extremely hard, Kirisawa Shogo begins to feel alive once again.
Kirisawa had achieved a brilliant career in high school boxing, winning four championships, but he had suffered from injuries, the death of his wife, and other bad luck, so he could no longer imagine a bright future. Concerned about his situation, his best friend Kai and his former teacher Ashiya persuade Kirisawa to become a "temporary coach" for the boxing team at his alma mater. At first, he is reluctant to take on the job, but when he sees the high school students, covered in sweat and hitting the sandbag, "wanting to be strong" and "wanting to win," his own passion gradually comes back to him.