It's a medieval Era where rare people have unimaginable abilities have you ever wondered who discovered space who made the laws of physics or who created religion those were things humans couldn't figure out alone "A key and A Grimoire" is the story of the youngest son of the Ferdinand family. The Ferdinand family is a family founded from the acquisition of the 7 Grimoire of knowledge of Salomon these Grimoire the secrets of the world but only focuses on each topic they granted powers to owners