At one point in the story, Myne tells Lutz that she is actually a reincarnation, and the original Myne was in all likelihood swallowed up by the heat of the Devouring. I found this explanation kind of strange. As a Japanese person, Myne should be familiar with reincarnation. But here she guesses that her soul was dropped into an existing person who died, and she seems fairly confident with her guess. At the very least, I haven't seen her offer an alternative explanation where I am in the light novels (volume 3).
So is it really the case that the original Myne died? Or is Myne simply a reincarnation as in many other Isekai stories, who suddenly regained her memories of her previous life?