In a world governed by magic, Yuno and Asta grew up together with a single goal in mind: to become the next Emperor-Mage of Clover's kingdom. But if the first one is naturally gifted, the second one, as for him, does not know how to manipulate magic. Thus, during the ceremony of awarding their grimoire, Yuno receives the legendary four-leaf clover grimoire while Asta, on the other hand, leaves bradouille. Later, an ancient and mysterious black work decorated with a five-leaf clover emerges in front of him! An anti-magic grimoire...