Is 91 Daze hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 7 episodes · PG-13 - Teens 13 or older
Comedy, Historical, Organized Crime
91 Daze is a series of shorts included in various disk packages. They focus around Angelo, Nero, and sometimes Corteo in various comedic situations. (Source: 91-days.wikia)
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