Shogo Higuchi is a brilliant detective who is always on the go and has a knack for sensing things. Since his wife was murdered by a psychotic killer, he has been obsessed with revenge. Hikari Tachibana is the head of the Emergency Command Center and a voice profiler (voiceprint analyst) who hears even the faintest of sounds. Two people who lost a loved one and carry wounds that will never heal. As the never-ending crimes plague their city, they respond to the influx of 110 calls. Follow them as they solve crimes in this suspense-filled drama, relying on the "voice" that pleads to live as a guide.