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

TV · 4 episodes · PG-13 - Teens 13 or older
Action, Adventure, Fantasy, Martial Arts, Shounen
A new anime project in celebration of Naruto's 20th anniversary.
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