A Meager Hero

Not all heroes have heroic personalities
Aiden isn't smart or strong, but he has the responsibility of saving the world from the black dragon Belial. He jumped at the opportunity and the fate of the world rests on his shoulders. He will encounter many people who will try to get rid of him whether he knows it or not. Along the way, he will even encounter the previous hero who tried to face Belial but failed.
Will he become a hero despite being a meager boy or is humanity doomed because of Aiden's impulsive action?