Extra's Path To Demon King

Synopsis

When the goddamn story leaves you no choice but to walk the path of the villain,The heroes aren't enough to save the world, as the calamity ultimately kills everyone and everything. Then, only by becoming the demon king can you survive, and only the demon king can save the world, but how? Of course, by conquering every other race, obviously. Can Axel become the demon king and survive, maybe save the world in the process?