Is School Rumble San Gakki hentai?
English title: School Rumble: 3rd Semester
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2008 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Gag Humor, Love Polygon, Romance, School, Shounen
A short 2 episodes attempt to conclude the series. Karasuma goes to America after the end of the third term. Will Harima finally confess? What will happen with Tenma and Karasuma?
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