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

OVA · 2014 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Historical, Parody
Unaired episode adapted from the manga chapter "I Was Overwhelmed by Heroines."
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