Is Kotoura-san: Haruka no Heya hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2012 · 6 episodes · PG-13 - Teens 13 or older
Comedy, School
Mini episodes of Kotoura-san introducing each of the series' characters.
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