After the "end of the world," God chose mortals to become like the angels because most of his angels were wiped out by the war with Lucifer.

So the general idea is you play an angel either in a utopia or dystopia. You can be a fallen angel, a holy one, an angel that became human somehow, etc.

Since this is a story dealing with angels, God, religion, etc., there will be religious motifs and themes, so if you dont like that stuff, dont join.