Is Moetan hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV · 2007 · 12 episodes · R+ - Mild Nudity
Comedy, Ecchi, Mahou Shoujo, School
Ink Nijihara is a girl in high school. Unfortunately her crush Nao Tezuka barely recognizes her. To make matters worse, she is very short. Now Ink meets a duck and becomes a "mahou shoujo" and teaches Nao english in disguise. (Source: ANN)
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