@Local Dumbass this is just my guess but i think its because the witch wants to stabilize that novel world after sending our girl and her guardian knight away to the other world. And this is how she plans to do it, Im not sure how this works but i guess its possible?
*sips tea while watching* Im just here to watch the Chaos unfold - my pfp sauce is Yuki from "Nekomusume Shoukougun" here I'll share some good books https://mangabuddy.com/manga-list/125599