Mark, an unknown mercenary, pretends to be someone else and gets a place at a prestigious military academy. In it, the heirs of the Great Houses learn to control giant walking war machines. Previously, the Houses fought among themselves, but now they live in peace and mine ignium - the invaluable fuel on which all equipment runs. It would seem that these are the long-awaited calm times, but someone in the academy is trying to provoke a new big war between the Great Houses. And a former mercenary with combat experience will be useful on it... But all the wars in this world are fought only because of one thing - we die for Ignium, we kill for Ignium.