I! Brave?

In this world where brave men and demon kings exist, the ending of the ancient ballad has already been written: the brave man chosen by the goddess will hold the holy sword, defeat the demon king, and bring peace to the kingdom. But in the eyes of Ed, who returned from more than ten years later, these are meaningless. The kingdom is not important, the people are not important, the devil is not important, and the goddess is not important. Become a brave man who saves the world? Even less important. There is only one important thing: Kill all the strange beasts.