I haven't read the source material for this manga, but this fallen queen/demon queen lady barely exists at all in this story. At this point I have to wonder why she was introduced at all in the beginning if she has no role to play. Even if she becomes important later, why not introduce her then? Right now she seems to serve no purpose other than to mislead readers of the first chapter. When I read the first chapter, I was under the impression she'd be the main heroine. Now, seven chapters in, I feel they could erase her from the story and nothing would change.