Sensen Senki

In an age of war, where numerous countries divide the world, a certain small nation was attacked and destroyed by a wildly ambitious, tyrannical king, and a single boy was taken captive. However, the boy had not given up on one day saving the people from the tyrant’s grasp. To achieve that goal, the boy set his sights on becoming a "Sennin"—a being who possesses supernatural power!!