Natsume Hamanaka loses her younger brother and her eyesight in an accident on the night of her graduation from the police academy. As a result, she gives up on her dream as a police officer. In the subsequent three years, she lives in isolation in the company of a guide dog. One day, another car accident meets Natsume again. She hears a faint cry for help from a young girl at the scene, and reckons that the girl could be a kidnap victim. However, the police does not take her deduction seriously and does not to pursue the matter further. Natsume stumbles upon a skateboarder who happens to be a witness of the accident, and convinces him to trace the suspect together. As investigations progress and gain more hands, Natsume becomes more vulnerable to danger, which begin to follow her.