Is Gokukoku no Brynhildr: Kara Sawagi hentai?
English title: Brynhildr in the Darkness Special
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, Sci-Fi, Seinen
Unaired episode 11.5 included with the second Blu-ray/DVD volume.
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