She's an archangel.
Shingeki no Bahamut: Virgin Soul
Mistarcia is a magical world where humans, gods, and demons mingle together. In the past, the black-and-silver winged Bahamut has threatened to destroy the land, but humans, gods, and demons overcame their differences to fight together and seal its power. Now, two thousand years later, Bahamut threatens the land again.
