After seeing a man's skull split by an axe, 16‑year‑old Yuri Honjou shivers with terror and bewilderment as she escapes the masked attacker, only to discover she is confined within a derelict structure whose every entrance has inexplicably sealed. In frantic pursuit of an exit, Yuri climbs to the roof, yet a lifeless expanse surrounded by towering skyscrapers greets her. Though despair floods her, the revelation that her brother also lingers in this bizarre locale steels Yuri"s resolve to locate him and flee. Yet she soon realizes additional masked killers roam the vicinity, eager to frighten their new prey and fulfill grim cravings, leaving Yuri uncertain whether they can survive the ordeal. The oppressive silence only deepens the sense of impending doom, and every echo feels like a warning.
