Is Gakuen Utopia Manabi Straight!: Natsu da! Manabi da! Kyouka Gasshuku da! hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2007 · 1 episodes · G - All Ages
CGDCT, Comedy, School, Sci-Fi
This episode takes place before the actual planning of the School Fair and shows how the girls spend their summer holidays.
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