While Yuno is able to wield magic with amazing power and control, Asta cannot use magic at all and desperately tries to awaken his powers by training physically. However, as they grew up, the stark difference between them became evident.

Raised together as children, they came to know of the 'Wizard King'-a title given to the strongest mage in the kingdom-and promised that they would compete against each other for the position of the next Wizard King.

Asta and Yuno were abandoned at the same church on the same day.