Original. having currently have read 300+ series I can say there are none which I felt that were overly similar.
Simply the art I found good but hard to follow in the action (which isn't the focus of the manga anyway)
The world building was nice
The characters were not overly complicated but I found to be a good fit especially leading into the last volume
If you like the feel of the first chapter or two then it's probably a good manga for you and otherwise just drop it because it will only get more confusing as it goes on