Ulysses’s greatest wish in his life is to become a respected priest, but by chance, he became the successor to the demon king selected by the “Book of Curses”. Since then, his fate has undergone a drastic change. The fiancee who claims to be the “heroine”, the cute familiar spirit who guards the “Book of Curses”, the witch with terrible magic skills but excellent sword skills, the holy maiden with the ability to summon divine beings… one after another beautiful girls with unique personalities begin to appear beside him. Can he really become a pure-hearted priest as he wishes?