Is Minami-ke Okawari hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2008 · 13 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy, School, Seinen
A new year has started, and the three Minami sisters—Haruka, Kana, and Chiaki—are still living together without adult supervision. As the seasons pass, the girls continue to make friends and find new interests. No matter where they are or who they hang out with, the sisters' time remains ever vibrant. [Written by MAL Rewrite]
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