A young girl with amnesia is admitted to a Tokyo hospital's psychiatric wing. Raised in secrecy, she barely managed to survive a fire started by her mother who, because of the former's telekinetic powers, believed her to be the reincarnated Sadako. Psychologist Mayu Akikawa quickly grows fond of her, seeing herself reflected in her solitary past, a lifetime of loneliness. Meanwhile, Mayu's brother Kazuma, a producer of absurd online videos, attempts to boost his viewership by broadcasting an excursion into the burned ruins of the girl's house, when he suddenly disappears. Alarmed by the last-seen images of her only family and by several supernatural events linking her new patient to Sadako's curse, Mayu sets off in search of Kazuma.