Is Girls & Panzer: Fushou Akiyama Yukari no Sensha Kouza hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2012 · 6 episodes · PG-13 - Teens 13 or older
CGDCT, Educational, Military, School
Girls & Panzer specials with Yukari Akiyama explaining the background of tank units that appear in the series.
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