http://tvtropes.org/pmwiki/pmwiki.php/M ... cherSchool
Despite all of the action in Ikki Tousen taking place in or around several high schools, there are absolutely no teachers or staff members visible ever. Perhaps they all got tired of being under attack by supernatural fighters all the time—or maybe they just have been killed already. Of course, one wonders why the police never shows up either despite the regular highly visible outbursts of violence, but maybe they just don't care.
I honestly don't know how to feel about this. Only posting here because this applies to Magical Diary as well.
Two-Teacher School
In reality(such as it is), there are more than two teachers in the school, they just weren't important enough to be worth devoting graphics to. We don't see the vast majority of the students either, after all...
Potsdam and Grabiner handle the introductory-level magic classes. They don't do everything!
Potsdam and Grabiner handle the introductory-level magic classes. They don't do everything!