Is To Heart 2 OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2007 · 3 episodes · PG-13 - Teens 13 or older
Comedy, Drama, Harem, Romance, School
A collection of stories involving the girls of To Heart 2, with each episode focusing on a different character. (Source: ANN)
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