Rie Kuwana

School principal Ozawa Gozo rapes his daughter, Mitsuko, after she sees her parents having sex. Her mother Sayuri witness the event. Gozo now rapes both of them as he pleases, while his family is undermined by incest, suicide, and murder... (imdb)

...The title literally means "slit-mouth woman" and is reminiscent of the gruesome ghosts of Japanese folklore. The movie is based on a famous urban legend from the late 1970s, in which a masked woman would terrorize young children on their way home from school... (monstermovieblog.blogspot.com)

A video recently posted shows something popping out of a closed toilet. Before the school was closed, rumors of "Hanako-san in the toilet" were whispered at the school, and now the interview team will try to confirm the truth.