Gakuen Sodom
English title: Professor Pain
Japanese title: 学園ソドム
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Aug 25, 1998 to Dec 18, 1998
Duration: 27 min per ep
Rating: Rx - Hentai
Studios: Artland
Producers: Green Bunny
Licensors: Central Park Media, Kitty Media
Genres: Hentai

The students of Aoi College, who are all 19 by the way, have always suspected that Professor Ohse might be some sort of pervert or cretin, but no one could have guessed how depraved he really is. As it turns out, he's really a terrorist who decides to hold the entire campus hostage, and make all of its comely young lasses submit to his desire for torture and depravity.

(Source: ANN)