The Demon King has decided to quit ruling The Great Floating City of Arcadia and give it to the humans and non-humans. He no longer has an interest after he had gotten everything he wanted in the world. After he left, his subordinates thought that he was already dead. But it was just his puppet. As for his actual body, he slept in his room for eternity since he wouldn't die.

The Demon King's favorite toy is his puppets. Because of those, he became a total shut-in in his room. While he was in his eternal sleep, the hero woke him up through his dead puppet. Forcing him to come after her, get out of his room, and destroy that puppet.

When he came out of his room, no one recognized that he was the Demon King as he always used a puppet. His subordinates didn't know that he was the Demon King they followed. Concealing his true identity to his followers, he soon realized the current life they've had after he left. A new chapter unfolds as he experiences the new world around him.

-- Warning --

English is my second language, so if you found something not right, please kindly point them out. 

This story will be quite long that even some mysteries won't be solve right away, and why the hell it happened in the first place. The fact that characters in this story have different POV about the mysteries happening in the story doesnt always mean their hunches are right.