I actually watched this anime a few years ago, when I was still in primary. This was when I started watching anime. Hell Teacher Nube, as a starting point is not bad. One of the best animes of it's time, I say. Basically, it's a school story with all the weird and scary things you wish could happen to you in a real school, that is, if you're into ghosts and that kind of stuff. Hell Teacher Nube is an anime about a schoolteacher with a demon claw inthe place of his right hand, which he covers with a black glove, and all the hilarious and touching and sometimes just weird adventures he has with his students as what seems like the entire pantheon of Japanese lower mythology causes havoc in their school and town.
Nube and the students deal with ghosts, UFO's, youkai, oni, doppelgangers, curses...you name it, they'll take care of it.
Urban legends are also incorporated into the episodes...spirits of suicides in bathrooms, ghosts appearing in photographs, odd gods...
What else could you want in a supernatural school anime?
The best part of this anime are the stories. When I watched it, the wonder of all the crazy creatures and the wacky characters was a lot of fun. But what hooked me was that it was my first foray into Japanese superstitious culture. The stories are absolutely great!