Is Hetalia: The World Twinkle Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 3 episodes · PG-13 - Teens 13 or older
Comedy, Historical, Parody
Extra episodes included in the DVD volumes of Hetalia: The World Twinkle.
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