This is a work of fiction. All the characters in it, human and otherwise, are imaginary, excepting only certain of the fairy folk, whom it might be unwise to offend by casting doubts on their existence. Or lack thereof.
There are only two worlds - your world, which is the real world, and other worlds, the fantasy. Worlds like this are worlds of the human imagination: their reality, or lack of reality, is not important. What is important is that they are there. these...
Science is a way of talking about the universe in words that bind it to a common reality. Magic is a method of talking to the universe in words that it cannot ignore. The two are rarely compatible.