Goku Sayonara Zetsubou Sensei
English title: Goodbye Mr. Despair OAD
Japanese title: 獄・さよなら絶望先生
Type: OVA
Episodes: 3
Source: Manga
Genres: Comedy
Studios: Shaft
Producers: Omnibus Promotion
Duration: 25 min per ep
Rating: R - 17+ (violence & profanity)

Sayonara Zetsubou Sensei OVA.