Is Hidamari Sketch x ☆☆☆ Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2010 · 2 episodes · PG-13 - Teens 13 or older
CGDCT, Iyashikei, School, Slice of Life, Visual Arts
A year later, the daily life of the students of the Hidamari Sou at Yamabuki High School continues: Yuno and Miyako are second years, Sae and Hiro are third years, and two new students, Nori and Nazuna, move into the Hidamari Sou. (Source: AniDB)
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