Is Kono Naka ni Hitori, Imouto ga Iru!: Ani, Imouto, Koibito hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2013 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, Harem, Romance, School
Unaired 13th episode of the TV series.
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