Is Nanatsu no Taizai OVA hentai?
English title: The Seven Deadly Sins: Ban's Side Story OVA
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 2 episodes · PG-13 - Teens 13 or older
Action, Adventure, Fantasy, Shounen
OVA bundled with the 15th and 16th volume of the manga. 15th volume DVD will feature the sin of greed as the central character. 16th volume DVD will feature side stories of the main characters in omnibus format. (Source: MAL News)
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