Unify the World with the Demon King

One of the branches of the big world, the world created by Dream Alice. He is a disciple of the God who created the world and an absolute powerful man; She was the devil who once ruled the entire world, the absolute ruler; His encounter with her was just a casual interest, but his and her fate would not be written so simply. He will leave this thousand-layered maze, and she will rule the world again; he will launch a war for unknown selfish desires, and she will always wait for him. But, can he really create a new world for her and find a safe place to live? And can she find her true "self"?