[Anime Crossover] This Demon King Is Missing a Few Screws!

When a poker-faced person drops from the sky and lands on top of you, then solemnly tells you, "I am the Demon King," what are you supposed to do...? This is the story of a clueless Demon King traveling all over the world. He has a stone face, loves food, can't smile, and never stops talking. Sometimes he's so stupid he drives people crazy. Sometimes he's so powerful it leaves them amazed. Playing innocent? That's just his nature. Causing destruction? That's his true nature. In short, it's the disastrous travels of a ridiculously adorable Demon King who drives everyone crazy! Theme: