Sawamura Keiji (Sorimachi Takashi) of Kanagawa Prefectural Police’s First Investigative Division, who is confined to office work while he is under treatment for insomnia, is hurriedly summoned by Taniguchi Goro (Hashizume Isao) the head of the First Investigative Division. A third case in a series of bizarre murders which have stoked public fears has occurred at a park in a residential district, and he is roped in to assist.