She is a women who was mutilated bye her husband, and returns as a malicious spirit. when rumors of alleged sightings began to spread throughout japan and caused panic in many towns. There are even reports in south Korea that in 2004 about a women wearing a red mask who frequently chasing children. And in October 2007 a coroner found some old records from the late 1970s that a women who was chasing little children. She was hit by a car, and died shortly after. Her mouth was ripped from ear to ear.
Although some stories describe her in a mental asylum her common stories are describe in the heian period. Her husband found out she was having an affair with another samurai and he used a sword to cut her mouth from ear to ear and asked "who will you think your beautiful now?"