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

TV · 2007 · 26 episodes · PG-13 - Teens 13 or older
Comedy, Drama, Fantasy, Historical, Sci-Fi
In Edo in the mid-1800's, fireworks maker Seikichi Tamaya and his friends struggle to live under the harsh morality laws imposed by the strict city councilor, which ban all luxuries, including fireworks. One day, a strange girl stops by Sekichi's shop with an equally strange request: she wants Sekichi to build a firework that can reach the moon. (Source: ANN)
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