In endless time, the boundary wall of the demon spirit world has always been very strong. Even though most of the creatures in the demon spirit world have a long life and are powerful, no one has ever wanted to break it, just like a otaku who loves his family will not destroy his beloved house just to go out.
Suddenly one day, it opened a round door by itself, and every creature from the demon world who was curious and passed through the door would come to a different world with their authority...
Concept: All loneliness will come to an end