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

OVA · 1984 · 1 episodes · PG-13 - Teens 13 or older
Action, Adventure, Comedy, Sci-Fi
Aqualoid was a prosperous planet, but an attack from a mysterious life force, the Inorganics, transforms it into a post-apocalyptic shell of its former self. When Nam finds a mysterious sword, he is suddenly the object of a planet-wide chase. With the Inorganics closing in, will Nam and his friends discover the secret of the sword and save their world? Or will they destroy Aqualoid in favor of a new Birth? (Source: AniDB)
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