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

Special · 2005 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Harem, Romance
Based on the D.C.S.G. game/manga. The story takes place 2 years after the happenings in the first series. A new, mysterious girl appears and attaches herself to Jun'ichi. Who is this new girl and which connection does she have to the Sakura on Hatsune Island.
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