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

OVA · 2014 · 2 episodes · PG-13 - Teens 13 or older
Reverse Harem, Romance
Two Brothers Conflict OVAs about Christmas and Valentine's Day. New OP and ED songs by the same singers were presented in these two OVAs. (Source: MAL News, edited)
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