Is Girls & Panzer: Saishuushou Part 3 Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2021 · 2 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy, Military, School
Specials included with Girls & Panzer: Saishuushou Part 3 Blu-ray and DVD.
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