ok, I'm not sure if this has to do with the kitsune that would come to the mansion I did find a small unmarked quest line that does have a kitsune in it.

it starts at a small fishing village that is between the fairy forest and your mansion, after entering the area u can going all the way to the right to a small dock where u can talk to a character who mentions u should see the water at night. to do this u will need to speak to the storekeeper who will let you stay the night at the inn for 10g, after going to sleep a scene where u will talk to the character on the dock then when she lefts u speak to a kitsune who mention to where u need to go to find the girls father. the location is the steampunk theme town where u is far to the north across the sea. after finding him and talking to him he will return home where if u talk to him in his house the kitsune from before will appear.

unfortunately, that is as far as I got so far but I'll try to get a recording of the walkthrough up in a day to two.