Is Goku Sayonara Zetsubou Sensei hentai?
English title: Goodbye Mr. Despair OAD
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 2008 · 3 episodes · R - 17+ (violence & profanity)
Comedy, Gag Humor, Parody, School, Shounen
Sayonara Zetsubou Sensei OVA.
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