Is To LOVE-Ru Darkness OVA hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 6 episodes · R+ - Mild Nudity
Comedy, Ecchi, Harem, Romance, School, Sci-Fi, Shounen
Bundled with the 5th, 6th, 8th, 9th, 12th and 13th limited-edition volumes of the manga.
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