Is Ore no Imouto ga Konnani Kawaii Wake ga Nai.: SD Chara ni Yoru Short Movie hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2013 · 13 episodes · PG-13 - Teens 13 or older
Comedy
Short specials featuring chibi versions of OreImo characters, included on the first limited editions of the OreImo Season 2 BD/DVD volumes.
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