Is Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!! Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, Romance
Nao looks over her 'Big Brother's Perverted Habits Diary,' looking over Shusuke's misfortune with seeking out various porn. (Source: Wikipedia)
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