I just read a couple chapters of a funny manga called: YURI IS FORBIDDEN FOR THE YURI OTA!?
The MC is a yuri otaku girl who manages to get accepted into a Marimite-like catholic school for girls (real Marimite-like, with gokigenyou, long skirts, rosaries, soeur system and all the gimmicks). The MC plans to spend the next 3 years watching the interactions of the other students and fangirling over their pure and refined high-class yuri. Sadly, another new student is a TOTAL GYARU (sexy, blonde hair, short skirt, open shirt showing off her boobs, lots of make-up and accesories, carries a cellphone, etc.) who starts corrupting the ojousama-like normal students with her uncouth ways! Thus the MC swears she will protect the purity of the perfect garden of lilies that is this academy! She will get in the gyaru's way and thwart all her plans! Even if she has to become her best friend to do so, lol.
I thought it was pretty amusing. Too bad there are only 2 chapters out.