Is Hakumei to Mikochi: Neji to Bed to Irori to Bakuchi hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2018 · 1 episodes · PG-13 - Teens 13 or older
Fantasy, Iyashikei, Seinen, Slice of Life
Special episode included in the second Blu-ray/DVD volume.
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