At the scene of a terrible murder, only Todo is able to find the surviving little girl in the closet–his niece Tsubasa. Four years later, Todo and his father are caring for Tsubasa, who no longer speaks, and Todo continues to work as a police detective. He's assigned to a new partner, a young woman with a promising future, Saeki. As Todo and Saeki team up to solve murder cases together, they will also both have to confront their own painful pasts.