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

OVA · 2016 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Historical, Parody
It's Halloween, and America decides to invite all the other countries to his party. Since there is a costume contest, the countries show up in a wide array of outfits, although it quickly becomes clear that some among them may have taken the competition a bit too seriously. But soon, the guests begin to wonder why America hasn't shown off his own costume. What could be the reason? [Written by MAL Rewrite]
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