Is Sweet Valerian hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

TV · 2004 · 18 episodes · G - All Ages
Action, Comedy
The Stress Team floats over the city, locating stressed out people and transforming them into monsters. To combat this, three girls reluctantly transform into the Sweet Valerians, bunny defenders of justice. (Source: ANN)
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