The Comeback Of The Demon King Who Formed A Demon's Guild After Being Vanquished By The Hero. The King of the Demon had a hard day. He came back only when he thought he finally defeated the hero. And back again. And back again. And back again. And back again. And the hero who constantly revived was forced to defeat the Demon Lord who could not sooner or later.
And he did. And he did. The hero conquered the Lord of the Demon, the peace spread all over the world, etc. The Last. This is it. This is it. This is the whole story.
... Kidding. ... Kidding. The Lord of the Demon sent his soul to an empty vessel, that saved his life but is unhappily weak. So, what is the King of Demons to do if he wants to control the world, but can not even defeat a child?