When popular high school student Chiko finds a discarded cell phone on her way to school, a mysterious voice on the other end informs her that someone will die at a specific location and time. Initially skeptical, she soon realizes the call is not a prank when the predicted death occurs. The phone keeps ringing, each call delivering a new warning about an impending suicide, and Chiko is forced to race against the clock alongside her quiet classmate Bando to reach the victims before it is too late. The story unfolds over a single night, drawing the two girls into a desperate, high-stakes chase through their city. As they struggle to understand who is behind the calls and why they have been chosen, the pressure mounts and the line between observer and participant blurs. The narrative focuses on psychological tension, the weight of responsibility, and the fragile value of life, all compressed into a short, fast-paced thriller.