Long ago, a war between gods and demons -- Ragnarok -- erupted, and the world was thrown into a state of chaos. Asgard, the realm of the gods, was overrun by demons and was on the brink of destruction. In desperation, the gods sacrificed their very lives to create fierce warriors known as Grim Angels. Each wielding a godly weapon known as a Diviner, these angels quickly brought the war to an end. The demons were sealed away, but the gods would soon follow. However, the gods were able to leave behind their power in the heavenly isle of Riviera. A thousand years have passed since the gods' demise. Signs of the demons' return have brought fear to this peaceful land. Without the gods, Asgard cannot withstand another war. And so, fearing their own demise, the Seven Magi, proxies of the gods, have made the fateful decision to actuate the Retribution, a cataclysmic event which will destroy both Riviera and the demons.