Is Tokyo Ravens: Kon ga Oshiete Moshi Agemasu! Maru Wakari Tokyo Ravens hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2013 · 3 episodes · PG-13 - Teens 13 or older
Fantasy, Urban Fantasy
Short web specials where Kon explains a bit more about the series and the Onmyouji world.
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