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.

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.

Yumi, a 20-year-old living in the countryside of Gunma Prefecture, has an older friend named Ishii. Eccentric and irresponsible, Ishii is far from ordinary, yet the two share an inexplicable bond. Yumi lives with her mother, who often tells her, “I love you more than anyone in the world.” Bound by those words, Yumi takes on the responsibility of supporting their household in place of her unemployed mother. One day, Ishii suddenly disappears, leaving behind a single note:“We are being questioned by life.”Those words become the quiet push Yumi needs to finally step out of her confined world. Five years later, now living a glamorous life in the city, Yumi finds herself reflecting on the past.Where is Ishii now? What kind of life is her living?