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

TV · 2013 · 14 episodes · PG-13 - Teens 13 or older
Comedy
The story involves two pairs of teenage elder sister and younger brother, the Shinmoto's who are a bit narcissistic and the Saitou's who look a bit mysterious. It follows their everyday life in school and at home. (Source: MAL News)
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