Ghost or Trick

This game is a novel adventure game about the mystery of a ghost that appears in a villa.
This story takes place in a world slightly different from our own.
In a certain city in a certain country, there was a detective agency.
All the detectives belonging to it were strange.
This was because they only investigated cases related to ghosts and monsters.
Then a request comes in for them.
The player becomes the assistant of detective Arthur and works with him to get to the bottom of the case.