In a world ruled by magic, Yuno and Asta grew up together with one goal in mind: to become the next Mage-Emperor of the Clover Kingdom. But if the first is naturally gifted, the second, for his part, does not know how to manipulate magic. This is how during the ceremony of awarding their grimoire, Yuno receives the legendary four-leaf clover grimoire while Asta leaves empty-handed. However, later, an ancient and mysterious black work decorated with a five-leaf clover appeared in front of him! A grimoire of anti-magic...