The City of Angels and the Demon Realm are two realms that can never be combined into one but exist on the same planet.
What makes the creatures that originally belonged to the same root system become so different from each other?
Who is the most powerful mage in the City of Angels? Who is the person who can really protect the City of Angels?
Everything seems to have become a secret. Because those who know the secret have had their memories cut off!
Between the City of Angels and the Ghost Realm of Demons, who is the real angel? And who is the real devil?