The Iron League hosts sports tournaments where teams of robots participate and are supervised by their "owners". Dark Prince, a team led by Mach Windy, engage in unfair play tactics to win games. Dissatisfied with their unscrupulous actions, Mach Windy leaves Dark Prince and switches to the league's underdog team, Silver Prince. Accompanied by his loyal teammates, Magnum Ace and Bull Armor, Mach Windy and Silver Prince gear up to take on their former team in challenging soccer and baseball matches, with a vision of emerging victorious.