Keiko Kirisima, a police detective, investigates two cases of suicide. The victims didn’t know each other, but there is a strange fact – they both called to one and the same place before dying. The questioning of witnesses shows that the victims suffered from strange nightmares. The clues search makes the detectives find the trace of a certain “nightmare detective”, who is able to get to people’s heads while they sleep. Unfortunately, he refuses to help Keiko in this case. But Kirisima is determined to unravel the puzzle and even decides to call on a mysterious number.