Ever since her parents were murdered when she was a child, Nonna Sawaguchi vowed to dedicate her life to justice and catching criminals so that no one else would have to suffer as she did. Now, having become a forensic scientist, she collaborates with the police, but life as an investigator is not as easy as it seemed. One day she meets Reiji Mano, the forensic scientist who solved the death of her parents and whom she admires greatly, but Reiji keeps a dark secret and his goals in the police are not at all clear. Thus begins a fast-paced crime thriller in which Nonna and Reiji will fight to uncover the truth and bring justice.