Holy Girl Paradigm by Morishima Akiko
Paradigm Girls Academy, a famous catholic combined middle and high school. Not interested in love, Aoi hopes a school life among the virtuous Ojou-sama would turn her into a graceful and high-class lady herself. Riri thought joining a girls’ school would allow her to finally find love. Bonding over having their dreams meet a harsh reality, a beautiful friendship(?) begins.