In a world where magic is everywhere, Asta—a loud and energetic orphan—has no magic at all. Still, he aspires to become the Wizard King, the title given to the Clover Kingdom's most powerful mage. Sharing the same goal, Asta's childhood friend and rival, Yuno, is gifted with the ability to wield strong wind magic. Despite this huge gap between them, Asta trains his body relentlessly every day, hoping to somehow awaken his magic and catch up to Yuno.
When a person turns 15 in the Clover Kingdom, they receive a Grimoire, an item that lets them use their magic to its full potential. At the ceremony, Yuno obtains a Grimoire with a legendary four-leaf clover, marking its wielder as exceptionally strong, while Asta waits in vain for his own. Feeling disappointed but unwilling to give up, Asta sees Yuno captured by a mage trying to steal Yuno's special Grimoire. Even though he is completely outmatched by Yuno's captor, Asta's determination to keep fighting earns him his own Grimoire—one with an unheard-of black five-leaf clover.