Strawberry Panic
http://en.wikipedia.org/wiki/Strawberry_Panic!
"The plot of Strawberry Panic! revolves around the lives of the adolescents who attend one of three affiliated all-girl schools which share a campus and dormitories. The schools are: St. Miator's Girls' Academy, St. Spica's Girls' Institute, and St. Lulim's Girls' School. The story's main character is Nagisa Aoi, a young girl entering her fourth year at St. Miator after being transferred from another school. On first entering the campus grounds she is overcome with joy by the overall appearance of the surrounding area, but her joy is soon turned to sorrow as she accidentally stumbles down a hill, causing her to be lost and disoriented. While walking around the grounds trying to work out where she is, Nagisa comes across an older student named Shizuma Hanazono, who happens to be Astraea Hill's Etoile, a very important person who acts as a representative between the different schools and has specific duties that she must fulfill. Nagisa is instantly overcome by Shizuma's beauty and finds that she cannot move. After Shizuma kisses her on the forehead, Nagisa loses consciousness and awakens in the school's infirmary. In an adjacent chair is another girl of the same age, Tamao Suzumi, who informs her that they are to be roommates in the dormitory.
In the ensuing story Nagisa is introduced to other students from each of the three schools; some she admires, some she is intimidated by, and some are merely friends encountered while attending St. Miator. The series encompasses the relationships the characters build with each other, climaxing whenever two of the characters start dating. The central focus of Strawberry Panic! is the lesbian aspect to the relationships between the girls from the three schools. Depending on the media type, the depiction of the relationships between the girls is variously presented, with more explicit fan service – appealing visuals of the girls in provocative situations – in the anime adaptation than in the manga or light novels. A hint of astronomical star imagery is seen throughout the series, as well as minor Catholic religious undertones including a St. Mary statue on campus and a large Catholic church in the center of Astraea Hill."