Is Tsuki ga Kirei Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Romance, School
A series of unaired comedic shorts released with Blu-ray and DVD boxes of Tsuki ga Kirei.
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