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

ONA · 2010 · 48 episodes · PG-13 - Teens 13 or older
Anthropomorphic, Comedy, Gag Humor, Historical, Parody
The pasta-loving North Italy, stalwart Germany, and timid Japan continue their misadventures through history as they reenact various events leading up to and during the Second World War. This includes the turbulent relationship between Hungary and Prussia, the War of Austrian Succession, Lithuania's early days, and the Invasion of Poland. During such tumultuous times, how will these personified nations work their way through the conflicts? [Written by MAL Rewrite]
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