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.

Suenaga finds his life on the verge of collapsing as violence consumes those around him. However, he finds a worthy opponent in Omura, an up-and-coming wunderkind who is trying to escape his violent past. The men's fight for redemption culminates in a climatic match brimming with raw, testosterone-fueled emotions. Upholding the Rocky Balboa spirit of learning to get hit and keep moving forward, Underdog is a tough, uncompromising epic that deserves a spot in the pantheon of great boxing films.