Yuri is transported to a world resembling medieval Europe and told he must become the next Maoh, the King of the Mazoku. However, he's not like the rulers they're used to, as he's kind and just.

As tensions rise between humans and Mazoku, Yuri must adapt to the land's customs and culture while trying to become a good Maoh. Will he succeed? Watch Kyo Kara Maoh! to find out.