The story of Broken Blade takes place in a world where machines move by using the magic of the users - so, everyone is in some way a wizard. The main character, Rygart Arrow, is the exception. He can't use magic, which makes him unable to operate the Golem war machines which are the backbone of the world's armies. However, because his school buddies Hodr and Sigyn happen to be the king and queen of the Krishna kingdom, he gets mixed up in an invasion by the Athens Alliance - an invasion led by their old friend Zess!