Story outline

A middle-aged man is taking a drink of beer. A young man (Matsuda) appears from under the floor, and it is revealed that the older man, Mitake, is a former teacher of Kagenuma's father. Kagenuma is being haunted by the soul of a daughter whom his wife had aborted without his knowledge. Mitake refuses to help him.

Kagenuma wakes up in hospital next to the body of Mitake, and surrounded by Mitake's children. Kagenuma had been in Mitake's dream, to find out who should inherit his property, but cannot answer. As he leaves, Kagenuma telepathically hears the selfish thoughts of Mitake's children, and realises that a messy legal battle is about to commence.

Meanwhile Lieutenant Keiko Kirishima (hitomi) has recently switched from the National Police Academy to a district police station. Her new colleagues, Detective Ishida ( Ren Osugi) and Detective Wakamiya (Masanobu Ando do not understand her, and are somewhat resentful of her qualifications. Her own prickly personality does not help matters; she interprets their casualness at crime scenes as a lack of professionalism. She is unable to stomach the gruesome scene at her first case, so Ishida mocks her.

Her first case is a young woman who has been found dead in her apartment, horribly slashed with a blade placed in her own hand. The fact that the apartment was locked from the inside convinces Ishida and Wakamiya that the case is a suicide; Kirishima is not so sure, as no note was left and a neighbour heard the victim crying out for help. Later, Kirishima's team is confronted by a similar case. A wife saw her husband slash himself to death while asleep in their bed.

Kirishima discovers a link between the two unrelated victims; both had last dialled the same number, a sequence not registered anywhere in the country. The recording of both conversations reveals a young woman saying "help me" over and over again. It is suspected that some form of hypnotic suggestion was used. Because of the strange nature of the cases, the chief of the division separates the investigators into two groups. One, led by Detective Ishida, is to carry out 'the standard procedure', while the other, led by Lieutenant Kirishima (and including Detective Wakamiya), is to investigate supernatural causes for the murders. This frustrates the rationalistic Kirishima. She and Wakamiya are directed to Kagenuma, who is described as a person with the power to enter dreams.

Kagenuma is very unwilling to help. He does not like to use his power. In fact he had just tried to kill himself, but kids from the neighborhood saved him. The police leave him. Kirishima suggests calling the mysterious number. In the end Wakiyama makes contact but the woman (O) seems to know something is wrong. Soon after Wakiyama is attacked while asleep. Kirishima again asks the Nightmare detective to intervene. Wakamiya has fallen asleep on the couch in the police station. Kagenuma finally enters Wakiyama`s dream and confronts O. Wakiyama is killed and Kagenuma ends up hurt. He want to escape, but Kirishima forces his hand by calling O herself. So he must enter her dream, or let her die. He reluctantly decides to try to save her. Meanwhile, the other squad is getting close to O in the real world.