Travel to Another World and Become the Demon King

An ordinary employee suddenly traveled to another world one day, but the style of painting seemed a bit strange. Don't we usually become brave or have some special profession to fight the Demon King together? Why did I become the devil? What? Too many brave men can only become demon kings! Ah! It's so hard for me. This is the story of a demon king who conquers and saves the world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.