Is Nexus hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Music · 2011 · 1 episodes · G - All Ages
Music
Third single release from ClariS featuring a tie-up song with the light novel "Ore no Imouto ga Konna ni Kawaii Wake ga Nai". Limited edition of volume 9 of the novel includes a bonus DVD with the music video. (Source: AniDB)
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