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

TV Special · 2007 · 2 episodes · PG-13 - Teens 13 or older
CGDCT, Iyashikei, School, Slice of Life, Visual Arts
The four girls at Hidamari apartment complex continue her lives having a good time together. On the first episode of this special, they go together to the pool, and on the second episode Hiro receives a love letter on her locker, who could have sent it?
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