By the end of the 22nd century, all conflicts have dissipated and technology is utilized for amusement. Iron Leaguers are robots specialised in sports and their playing style always makes spectators crazy with excitement. One of the League teams, Silver Castle, which always maintains a spirit of fair play, is joined by Magnum Ace and Mach Windy, and begins taking on new matches to get out of its permanent last place position in the rankings.