Gyakkou shita Akuyaku Reijou wa, Nazeka Maryoku wo Ushinatta node Shinsou no Reijou ni Narimasu: Seijo Anna no Monogatari

Anna, the daughter of a baron, was born into a small, rural aristocratic family, but at the request of her kind parents, she ended up attending the country's most prestigious school, the Trusova Magic Academy. At the school, which is a microcosm of the hierarchical structure of the aristocracy, she nearly loses her place, but her fate changes dramatically when she meets the noble and beautiful young lady Rachel. Another story of reversal told from the perspective of Anna, who eventually becomes a saint.

(Source: Kadokawa, translated)