Is Nande Koko ni Sensei ga!? Nande Koko ni Sensei-tachi ga!? hentai?
English title: Why the Hell are You Here, Teacher!?: Thirteenth Period
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2019 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, School, Seinen
Unaired episode included with the Blu-ray box set.
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