Is Free! Eternal Summer: Kindan no All Hard! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · PG-13 - Teens 13 or older
Comedy, School
Unaired episode included with volume 7 of the Blu-ray/DVD.
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