Charlie in Underworld

A ghost office in a ghost station where the living and the dead are mixed.
Charlie wakes up there, but he doesn't remember anything.
In order to recover his memories, he gets the help of ghosts, who are full of strong personalities.
Things start to turn out completely different from what I expected.
After [Underworld Office], it is given to players who have grown up
A little dark, the story of the other side of the world.