Gyakutai sareteita Shouka no Reijou wa Seijo no Chikara wo Te ni Ire, Mujikaku ni Youshanaku Gyakushuu suru

The discarded girl is the strongest saint!? She shows no mercy to her enemies! A popular work from "Become a Novelist" is eagerly awaited to be turned into a manga!! Sonia, who has been oppressed by her aunt's family for many years, is discarded in the forest and prepares herself for death... Although Sonia is prepared for death, she is found by the kindhearted priest Falne...!? An exhilarating tale of a discarded saint's revenge!!

(Source: Akita Shoten, translated)