Gaiaterra: Elysea's Conflict/The IS Project

Infinite Stratos, abbreviated as IS, are powered exoskeletons, which were originally meant for outer space exploration. Originally designed by a Katsuragi named Tabane Shinonono, they possess technology and combat capabilities far more advanced than any other weapon system, thus threatening to destabilize the world of Gaiaterra. However the project was abandoned when a group of Encantadians stole their designs and blueprints for use as their personal vehicles of the Sang'gres, their leader of the Aristocracy.