Katherina is a genius witch who has mastered every known spell and even invented some of her own. She graduates Dornstadt school of witchcraft and wizardry four years early and is happy to start university when reality starts breaking around her.
Rifts into parallel worlds appear and the multiverse of timelines threatens to break apart the fabric of reality. She is willing to ignore all of this until it starts to affect her personally and she sees a parallel version of herself in a rift.