Kenji likes to think that he and his gang of friends are the bad boys of their school. That is, until he meets the four insane girls of a game-making club whose personalities are all super weird (and a little on the violent side). When Kenji’s forced to join their little group, his life quickly takes a turn for the outrageous.
Both are boke and tsukkomi comedies set in a high school, and feature a cast of pretty crazy girls with varying personalities as they barge their way into a guys life, and cause all sorts of mayhem in the process.
Seitokai Yakuindomo is considerably more perverted than D-Frag, which is more of a straight up comedy series, but i feel fans of one will find the other interesting.
President of the Student Council at the almost-all-boys Seika High School, the hard-as-nails Misaki Ayuzawa works every day to make life easier on the small population of co-eds who have enrolled there. Though an unholy terror to all things male during school hours, in order to provide for her impoverished family, she secretly works after school at a maid cafe in Akihabara. However, when campus hottie Usui Takumi wanders into the restaurant during her shift, suddenly she finds her reputation in school at his mercy...
Maid-Sama and SYD are very similar in many aspects. Both are based around characters of High School Student Council mainly. Whereas SYD features an all girls school turned into Co-ed school, KwMS is opposite of it i.e. Boys school into co-ed school.
Other common feature is hardworking president in both series,who work hard to make school popular for the newer sex (biys in SYD,Girls in KwMS). While SYD takes pick on perverted comedy, KwMS takes on romantic comedy.
Characters in both are funny with many common features - Perverted,hardworkers and few stalkers!
If you enjoyed one, you will love other one.