Kohei (Atsushi Ito) and Keisuke (Toru Nakamura) work with the government and Tojo Medical University as Trinity. The project is to create a new technological system to determine cause of death. They then receive a threatening letter. The letter warns that the Kerberos Tower and Tojo Medical University will be blown up.

Meanwhile, a group of people die. Kohei and Keisuke are unable to determine the cause of death through autopsy.