The Jealous Witch Theory:
I think Miku was the witch and was jealous of Luka so she tricked the prince into thinking Luka was a witch when she was really an angel. (explaining why the song suggests she considered praying while she was being tied up and the appearance of wings at the very end) She used her own witchcraft to frame Luka and have her executed. It says the witch came to love the prince, explaining her jealousy. And then a similar line with a twist says the witch came to trick the prince, explaining the theory that Miku's jealousy drove her to frame Luka. The following line says she kept the magic hidden, and it shows an image of Miku walking with the prince, which could signify that he thought he could trust her when she was really lying the whole time to keep her secret and keep him to herself...There is, however, a line that conflicts with my theory where it says the witch cries as she is tied up, implying that the one who was tied up really is a witch. I have two possible explanations for this. Either it is because she is being treated as the witch and thus they call her one, or they consider her to be a good witch rather than an angel, while Miku is a bad witch. Then the song says that they are all fools who have been fed lies, which I believe were the accusations from Miku that Luka was a witch, and that it couldn't have been about Luka lying about not being a witch because then they would no longer be fools in that moment because she has already been "caught" or so they think, but in my theory they really are fools because they believed Miku. There are also lines that say there's "no need for a magic to stop time, no spell can achieve what I feel" which I believe makes the point that Luka didn't need to do any witch-like things to earn the prince's heart because they already had true love. And mirroring that theory; the line "if my love was just a curse then I have only tears to shed" she is proclaiming that if her love was all fake because of dark magic, then her life was nothing but sad. As one final point; in the line "no god can help her find her way" she has been doomed despite being an angel because of the power of the Witch Miku's dark magic which is why she gave up praying to God for help. This line could also be used to say she wasn't an angel because then God would have been with Luka, perhaps saying that she is simply a good witch rather than an angel or a bad witch.
Hey my dudes! I found this theory online and thought, "why not make a fanfiction out of one of the most heartbreaking song theories ever?" and now that is what we are doing! Thanks for reading! Love ya all!