Ayanagi City, a city on the Japan Sea, serves as the setting. It is a futuristic metropolis designed to carry out the recovery after the disaster caused by the "Apathy Syndrome" 10 years prior. Shin Kanzato, a high school student, and his younger brother Jun reunite with their elder brother Ryou, the chief of the Ayanagi City Police, after ten years. A number of weird episodes occur in Ayanagi City during the period, such as the crew of a submarine that mysteriously vanishes while in their submarine, or a spiritless symptom that shocks the world after ten years, or the case of the inside out corpse, in which a student takes on a harsh visage. Ryou investigates the group responsible for the string.