Yes, the joke (which you likely missed last week) is that the witch of the dorms is an actual witch, but it is much more complicated than that, going into the details of what being a witch means. The first anime skipped that part and went right into an anime-original ending instead. Which still leaves a lot of details about Kim covered by the manga out (and assumed by the producers to have been read judging by the way this series has been going).

Equally interesting will be the way Kim and Jackie become friends. They're so hostile now, but in the other series, they're best friends and even wear matching uniforms. Currently, Jackie is stuck-up, prim and proper, and Kim is exceptionally lazy and evil.