Is Diabolik Lovers OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 1 episodes · PG-13 - Teens 13 or older
Drama, Josei, Reverse Harem, School, Supernatural, Vampire
OVA of Diabolik Lovers included with the game Diabolik Lovers DARK FATE.
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