The story of "Monster Rancher 2" is largely non-linear with story events happening only after certain requirements are met (winning a battle, reaching a certain rank, etc.). The story begins with the main character going to register to become a trainer, it is there when Colt appears as the trainer's new official assistant. The "end" of the game is when a monster is able to beat the Big Four (the four highest ranked battles in the game) when this happens a video about the history of the monsters is shown. A monster who has beaten all four of the S class tournaments can then go on to compete in a special match for champion monsters like itself.