This woman was the mother of Mitsuko Souma. When she was with Mitsuko's father, they were a happy family but this changed when her husband did something that the government didn't like. In order to save his family, he left the family.
For awhile Mitsuko's mother tried to give her daughter a good home but there would be another big change when Mitsuko was seven years old. Her mother met a man who at first seemed nice and even gave the young Mitsuko a doll. This nice attitude quickly changed after he married her mother.
He would now beat his wife and sexually abuse Mitsuko and when she learned what was happening to her daughter, she didn't stop it and instead abused her daughter. These actions damanged Mitsuko beyond repair and eventually Mitsuko had a guy she was having an affair with to break into their home and murder her mother and stepfather.