This is a city where monsters still exist.
There are things hidden that people don't know, and in order to maintain the balance between the two worlds, there are psychics.
The Yin clan is the most powerful among the psychic clan.
There are three mysterious figures in the Yin tribe with powerful spiritual powers. No one knows how long they have lived. They only know that they have powerful spiritual bodies sealed in their bodies and they will always look like they are 17 years old.