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

TV · 2008 · 12 episodes · PG-13 - Teens 13 or older
Comedy, Parody, Shoujo
There is a World Beautiful-Skin Competition (WBC) to which the 3 billion women of the world aspire. Carrying on the 300-year legacy of the competition are the twin Bihada sisters, Sara and Saki.
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