Sen Sen Senki

In an age of war, with the world divided among several kingdoms, a young boy is captured and enslaved after a mighty warlord conquers his home country. Although his homeland now lies in ruin, the boy refuses to succumb to despair, vowing to one day liberate the people of this land from the warlord's tyranny. To achieve his dearest wish, he resolves to become a "Sage," a person whose powers transcend human limits!

(Source: K MANGA)