Is Yoza-Quar! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2013 · 6 episodes · PG-13 - Teens 13 or older
Comedy
Each of the six BD/DVDs will include one short. They will feature the characters in a "slighly risqué" light not seen in the main story.
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