Ministry of Justice (MOJ)
Deals with civil, criminal, immigration, family and registration of real estate matters, prosecutions, correction and rehabilitation of offenders, and state related litigations.
National Police Agency (NPA)
Includes statistics on crime in Japan, recent law changes, Japan's most wanted, and news.
National Research Insitute of Police Science
Responsible for the research and case work in the field of forensic sciences, researches on criminology and behavioral science, and researches on traffic safety and regulation.