Assassins Pride  

アサシンズプライド, Assassin's Pride, 刺客守則 ASSASSINSPRIDE

In a realm where only those with power can battle against mana, there lives a young man named Kufa. His mission is to serve as a tutor and discover Mareidas abilities, who comes from a wealthy duke's family. If she lacks talent, he must eliminate her-this is the grim reality of his assignment.