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

OVA · 2020 · 10 episodes · PG-13 - Teens 13 or older
Shounen, Sports, Team Sports
A stop-motion anime that will bundle with the 42nd compiled book volume of Haruichi Furudate's Haikyu!! manga. Anime will have 10 short episodes featuring the Karasuno team as puppets. (Source: ANN)
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