He left a promise broken...

Before his death the one known as the Demon King left a promise broken, in the end he'd failed. Failed to create a place of peace for those persecuted as monsters, failed to do right by the memory she left, failed to save those that had supported him through his war against man, elves, dwarves and the gods themselves. His only solace; that he would meet his old friends once more in death. 

But it seemed the gods would refuse to grant him even that...

By unknown means he is forced into the body of his four-year-old self and burdened with the task to fulfill the promises he'd broken. To find a path to peace when about him all called for war, gather friends and allies not just monster, not just human, his goal to turn the very order of the world upon its head while forces far greater than he imagined moved against him. With this new life he must put right what he had made wrong,

No matter how steep the road ahead.