That ghost is a leftover from a early alpha that I tried to remove unsuccessfully.
Completely removing broke the game or something. It's been a long time so I don't remember.
My solution to the problem was to make it so rare to appear that the odds are about one in ten thousand players will ever see it.
Somehow every year someone manages to locate the ghost and it always amazes me.
The plot to the sequel has changed a lot since then but you'll eventually be able to meet other trans magic users and ghosts.
The primary reason that the hidden ghost was cut was that encountering her dramatically changed the emotional tone of the game.
The prototype which changed a lot was that detaching too much from your body could make you literally just lose your body.
You would help another trans magical girl who lost her body.