Joseph Watanabe, the world's greatest martial artist's mysterious disappearance leaves the underground world in turmoil and his family's legacy tarnished. Eight years later, his 16 year old son, Cain, decides to become a martial artist like their father and take back Joseph's lost championship title, refusing to let the world define the Watanabe legacy whilst also avenging their father. Cain commits fully to the dream, becoming a martial artist, no matter the cost.