Is Anime Tenchou x Touhou Project hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2010 · 1 episodes · G - All Ages
Fantasy
A collaboration anime project of Anime Tenchou and Touhou animated by ufotable. The anime was shown at the 2010 Animate Ichioshi Bishojo Anime Matsuri.
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