Is ACCA: 13-ku Kansatsu-ka Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 6 episodes · PG-13 - Teens 13 or older
Seinen, Slice of Life
The Kingdom of Dowa is free at last of political tensions and coup d'état rumors. Jean and Lotta Otus spend their days together with their best friend Niino, enjoying carefree conversations accompanied by alcohol and cigarettes. Although they look out for any potential threat to Dowa, even the administrative leaders of ACCA seem to relax in the long-awaited warmth of peace. [Written by MAL Rewrite]
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