Is Ore ga Suki nano wa Imouto dakedo Imouto ja Nai Specials hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2019 · 2 episodes · R+ - Mild Nudity
Comedy, Ecchi, Harem
Special episodes bundled on the first 2 BD/DVD of the anime "Ore ga Suki nano wa Imouto dakedo Imouto ja Nai".
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