Both Angel bothers always had disputes wether humanity was worth saving or not, the eldest brother Athael had pure black hair and red eyes, and due to being exiled from heaven his wings are as dark as the night, while the younger brother Rael has pure white hair and golden eyes, his wings are as white as snow. Both bothers entered the Temple that separates heaven and hell and have called upon the ultimate weapon(you) that will decide humanity's fate,and will fight for you to choose either side