Is Gakkatsu! hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

TV · 2012 · 25 episodes · G - All Ages
Comedy, School
In a fictional school, "Tender Tank" Rareko is constantly opening absurd yet strangely enthusiastic debates, this way creating a lively classroom life. Bringing up tremendous themes, she and her classmates exchange words like sword-strokes, and here and there even a profound remark is slipped in. A fun and informative debate comedy, packed into only five minutes each time. (Source: AniDB)
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