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

OVA · 2012 · 2 episodes · PG-13 - Teens 13 or older
Comedy, School, Seinen
Unaired episodes bundled with the special edition of volume 4 of the original manga.
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