Is Eyeshield 21: Jump Festa 2005 Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 1 episodes · PG-13 - Teens 13 or older
Shounen, Sports, Team Sports
A brief OVA about the Devil Bats training on an island.
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