Masako's mother, a psychiatrist, has a son, Toshiya, who is a shut-in. Toshiya, who has feelings for Masako more than a mother, satisfies his sexual desire by fantasizing with the recorded sounds of Masako's use. Toshiya was unable to talk directly to Masako, and listened to his mother's voice under the guise of a prank call. One day, Toshiya calls Masako's hospital and hears the screams of his mother being raped by a patient. Toshiya can't help even if he wants to. From that day on, their relationship changes dramatically.
