Is Recorder to Randoseru Mi☆ Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2013 · 1 episodes · PG-13 - Teens 13 or older
Comedy, School, Seinen
Unaired episode 13 included on the Blu-ray/DVD volume of the Recorder to Randoseru Mi☆ series.
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