Moroha Haimura enrolls at Akane Academy, where students called Saviors train to fight the monsters known as Metaphysicals. Most Saviors remember a single past life that grants them either swordsmanship or sorcery; Moroha wakes with two, one as the swordmaster prince Fraga and one as the sorcerer king Shuu Saura. His double inheritance puts him in the sights of classmates Satsuki Ranjou and Shizuno Urushibara, each tied to one of those former selves.