School principal Ozawa Gozo rape

Rape

Rape is a type of sexual assault usually involving sexual intercourse, which is initiated by one or more persons against another person without that person's consent. The act may be carried out by physical force, coercion, abuse of authority or with a person who is incapable of valid consent. The...

s his daughter, Mitsuko, after she sees her parents having sex. Her mother Sayuri witnesses the rape. Gozo now rapes both of them as he pleases, while his family is undermined by incest

Incest

Incest is sexual intercourse between close relatives that is usually illegal in the jurisdiction where it takes place and/or is conventionally considered a taboo. The term may apply to sexual activities between: individuals of close "blood relationship"; members of the same household; step...

, suicide

Suicide

Suicide is the act of intentionally causing one's own death. Suicide is often committed out of despair or attributed to some underlying mental disorder, such as depression, bipolar disorder, schizophrenia, alcoholism, or drug abuse...

, and murder

Murder

Murder is the unlawful killing, with malice aforethought, of another human being, and generally this state of mind distinguishes murder from other forms of unlawful homicide...

... such is the erotic novel wheel-bound novelist Taeko sets on to write. She is assisted by Yuji, a young man who is actually on a mission to uncover the reality of this story, of Taeko's past, and of the locked room in her apartment.