Shuichiro Kiriyama returns to Japan after working for the FBI [in America] for 12 years. Once again, he starts working with the Statute of Limitation Management Department. Since the statute of limitation for serious crimes like murder were abolished in April, 2010, the Limitation Management Department has become an easy, worthless job. As a hobby, Shuichiro Kiriyama begins to investigate the unsolved cases which are about to be abandoned due to the expiration of the statute of limitation. Shizuka Mikazuki joins him once again.