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

Special · 2015 · 12 episodes · PG-13 - Teens 13 or older
Comedy, Seinen
These shorts, included in the Blu-ray and DVD releases, take place in a timeline with multiple Umaru-chans.
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