Remikawa Nanoka never expected her first night shift as a civilian emergency dispatcher to end in tragedy. When a terrified woman calls for help, Nanoka’s rising panic leads to a fatal mistake on the control board. Instead of updating the police, a slip of her finger inadvertently broadcasts the victim's exact location directly to the killer. Forced to listen helplessly to the gruesome aftermath, Nanoka's nightmare truly begins when an unfamiliar, chilling voice whispers through the headset, thanking her for the information—and promising that she will be next.

Now, too terrified to even step outside her house, Nanoka remains trapped within her own walls. But as the silence grows heavier, the lines between reality and auditory hallucinations begin to blur. Can she survive the crushing weight of her own mind, or will the phantom rings of a desperate phone call finally break her?