Ore wa Akutou de wa Arimasen

I am not a villain. Cain von Euclid, the grandson of the First King who united the First Continent, is told by his beloved grandfather that he is fated to become the most powerful villain of all. Unable to bring himself to kill his own grandson, the king instead takes Cain on a long journey to prepare him for the dark destiny ahead. Over the next 13 years, they travel through the Second, Third, and Fourth Continents, where Cain grows incredibly strong. Eventually, he sets out on his own, encountering many people who shape his path along the way.