 At the beginning of the game, it is revealed that the main character's mother has died and that the player's father is a Monkey Boxing trainer who is kidnapped along with the main character's brother/sister (depending on who the player chooses to be) by the Saru gang of monkey gangsters.It is up to the player to advance through the Monkey Boxing Leagues to confront Saru and rescue the player's father and sibling.It is later revealed that they are being brainwashed into training and fighting monkeys for Saru.