Guilty Gear 2: Overture

Humanity created the Gears, biological weapons based on an endless energy called divine power. But one of the Gears went berserk, declared war on humanity, and started a terrible war. In response, mankind formed an order of elite knights, ending the Gears' reign of terror. It seemed that peace had been restored. But true history has yet to reveal itself, until now, in Guilty Gear 2 Overture!