Alex is a black-winged angel knight who is at the forefront of protecting the fragile white-winged Angels. However, to protect the palace of the white angel, Alex was willing to be sealed in the dark abyss of the demons and could not return to the heavens above. but one day Alex found the figure of a white angel girl whose wings seemed to have been broken off

"fragile white angel Your place is not in this abyss of darkness Go back to the sky palace"