Otome Holic

Riko started a wonderful high school life with literary and military arts. but she has the feeling she'll get in troubles. the low grade Kurose Yui is a pervert and an uncool boy. he's detestable! and then he stole the chair of the school principal's son who's the best student. He will even find out what Riko dream about....
(Source: Chibi Manga)