As criminals become more sophisticated and crimes more complex, the police must turn to speedier and more scientific means of weeding through clues and narrowing down suspects. That's where the forensics labs come into play. Investigator Mariko (Sawaguchi Yasuko) is a highly talented forensics scientist who must dodge stereotypes, as well as disparaging comments from veteran detectives including her ex-husband (Watanabe Ikkei), the Chief of Detectives.