X-02 is a combative pilot robot fighting on the edge of the frontier. X-02 has been stranded on the planet 0-12-146 (Legacy). It is large, stormy, and covered with militia forces, but years after the IMS abandon the fight on Legacy, X-02 fights on, following the last order he received. But, when he encounters a Militia elite pilot squad, his loyalty to the IMS is tested.