Underdog: Part One: Tells the story of three bottom-dog boxers who gets used as punching bags. Pro boxer Suenaga Akira fell off the path to greatness but still tries to crawl his way to the top. Omura Ryuta is a youngster who grew up in foster care. Miyagi Shun, a TV celebrity with famous parents, takes a shot at boxing as part of a TV show. Three underdogs with very different back stories put their pride on the line as they exchange blows.