Phia, the daughter of a knight and aspiring knight herself, remembers her past life as the "Great Saintess" as she dies. The Saintess, a supposedly weak class on the brink of extinction, is widely worshipped. However, Phia's abilities are "lost magic" from fairy tales. She also recalls being threatened by the Demon Lord's right-hand man in her past life: "If you're reincarnated as a Saintess, I'll kill you." Using her powers would reveal her identity, leading to her death. Therefore, she resolves to become a knight and live peacefully. Despite her intentions, she still uses her powers...because they're just too convenient.