When I first picked this series I thought it would be another Azumanga Daioh... lol!!
It's definitely one of risque anime out there... but if you can bear the pantsu assault you might like the situational humor and have a good laugh... The series touches themes such as - first love, sibling rivalry, egocentric teachers, comradery, interschool competition and misconceptions...
Anime: 6
Manga: 7
PS: The anime was a pretty faithful adaptation of the manga.