Is D.C.III: Da Capo III Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2012 · 1 episodes · PG-13 - Teens 13 or older
Drama, Music, Romance, School
Special that counts down the best of the Da Capo theme songs and introduces the characters of Da Capo III.
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