Is Nekojiru Gekijou Jirujiru Original hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV · 1999 · 27 episodes · R - 17+ (violence & profanity)
Action, Anthropomorphic, Comedy
Based on the comics by the late Nekojiru. Contains 23 animated shorts aired TV Asahi Network's show "Bokusho Mondai Boss Chara Ou." and 4 unbroadcast episodes. (Source: AniDB)
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