Nande Koko ni Sensei ga!? Nande Koko ni Sensei-tachi ga!?
English title: Why the Hell are You Here, Teacher!?: Thirteenth Period
Japanese title: なんでここに先生が!? なんでここに先生たちが!?
Type: Special
Episodes: 1
Source: Manga
Genres: Comedy, Ecchi
Studios: Tear Studio
Producers: Kodansha, KlockWorx, Asmik Ace, King Records, Scarlett
Duration: 11 min
Rating: R+ - Mild Nudity

Unaired episode included with the Blu-ray box set.