Among the 5 star systems known as the Joker Systems, there are many kingdoms. There are knights within the kingdoms and these knights who control giant robots, Mortar Headds, are called Headdliners. Bound to the knights are fatimas. Human in appearance and mind, the fatimas (mostly female) possess expanded physical capabilities and make it possible for a Headdliner to control a Mortar Headd. Fatimas cannot reproduce. All this is overseen by Emperor Amaterasu and his Mirage Knights.