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