Genesis Survivor Gaiarth

It has been a hundred years since the end of the war between the Imperial and Republic armies. Humanity is spread out across the barren landscape, isolating themselves for better protection against the 'beasts' – rogue robots that are bent on wiping out mankind. But recently the attacks have been increasing in scale and frequency, and a wardroid-raised boy named Ital finds out why: the 'beast-masters', the part-human and part-robot controllers of the beasts, have returned. Together with his companion Zaxon, a wardroid who has lost his memory, Ital fights against the beast-masters. Why have they returned after so long, what are they up to, and who is this mysterious 'General' that they refer to?