Zan Sayonara Zetsubou Sensei

Also known as:  Goodbye Teacher Despair 3rd Season, Repent: Goodbye Mr. Despair

Nozomu Itoshiki is still the bizarre teacher of the even stranger Class 2-H. He attempts to teach his students the negative aspects of the world and society, only to have each circumstance thrown at his face whenever he tries. With more students and friends than before, Zetsubo-sensei's life bcomes harder and crazier than ever before. (ANN synopsis)

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Producers, official website and other details: AniDB, ANN, Wiki