Who is Shi Gui's mother-in-law recorded by Tiger Crane Demon Master?

It is employed by the largest demon family in Japan.

In the records of the Tiger Crane Demon Master, the mysterious mother-in-law used her special abilities to manipulate the evil monsters in people's hearts. It has great power and its background is extremely mysterious. The mysterious mother-in-law is often called the savior of the demon race. She has endless greed and ambition in her heart and wants to get more power by hook or by crook.