The background of the story is set in a world full of mystery and magic.In this world, people live together with monsters and ghosts, relying on each other but distrusting each other.The story revolves around a monster called the King, who is a kind but somewhat naive character.For some reason, the king was forced to hide his true identity, transform into a human and lurk in human society.

In human society, the king encountered all kinds of new and interesting things, and also met many different characters.He experienced many challenges and adventures in this new environment, and at the same time slowly became aware of the misunderstandings and barriers between humans and monsters.Through contact with humans, the king gradually discovered the kindness and courage deep in his heart, and also better understood the similarities and differences between humans and monsters.