After having an accident and being in a coma. His soul was transmigrated to the world of Strike the Blood where he was turned into a progenitor against his will and in his revolt became a tyrannical demon king. Until the day he was defeated and killed only to wake up in his original body in his old world, and he decided to live in peace. Only to find that his world was far more dangerous than he realizes. Can a demon king live a normal life of gods and devils?