Is Kono Yo no Hate de Koi wo Utau Shoujo YU-NO: Mugen no Heiretsu Sekai hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2019 · 1 episodes · R+ - Mild Nudity
Drama, Sci-Fi, Time Travel
Unaired episode included with the third Blu-ray volume.
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