Strawberry panic is yuri, or some people could call that shoujo-ai, manga, written by Sakurako Kimino. Later Madhouse studios made anime, licensed by Media Blasters.

Aoi Nagisa transfers to a new Catholic girls only school and discovers a community of fellow students entwined in an intricate heirarchy, at the top of which sits the all important Etoile. In order to fit in, Nagisa must go to class, join clubs, and make new friends. Meanwhile, Hanazono Shizuma, the Etoile of the school, finds herself drawn to this new, exciting transfer student. As Shizuma and Nagisa get to know eachother, Shizuma finally decides it is time to face her troubled past.

text from http://www.animenewsnetwork.com/