A wave of unexplainable suicides sweeps across Tokyo after 54 smiling high school girls join hands and throw themselves from a subway platform into an oncoming train. Detective Kuroda (Ryo Ishibashi, Audition) and the rest of the police force are baffled as the bloodbath triggers a wave of further deaths across the city. When a tip off appears to be tracking the suicides before they happen, the question becomes, are they really suicides at all?