Is Trickster: Edogawa Ranpo "Shounen Tanteidan" yori OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2016 · 2 episodes · PG-13 - Teens 13 or older
Mystery
The first episode will focus on the past between Kogorou Akechi and the Fiend With Twenty Faces, while the second will focus on the Boy Detectives Club before Kobayashi and Hanazaki met.
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