Homeless Demon King

the Devil King was defeated by a Human warrior and lost his castle. The Devil King made ends meet by working part-time at a convenience store, and not a day went by without Humans humiliating him in some way. He was so stressed out that he became bald and got dumped by his girlfriend. He was in despair when he realized that his people were also harassed by the Humans. He made up his mind to reclaim his castle from the accursed Human hero!