A series of gruesome murders occur within the vicinity of a park. Having gotten past her rival and fellow Superintendent, Yukiko Muromachi; Superintendent Yakushiji and her subordinate, Assistant Inspector Izumida question a former Minister of Health, Labour and Welfare for his involvement in the illegal experimentation involving human cells and that of an unidentified primate. Their investigation reveals a lead to the whereabouts of the experiment which may just help put an end to the series of murders.