A young man dies from burns to the head when partying out with his friends at night. Police investigators believe it to be an accident caused by the firecrackers the deceased possesses, but his friends claim spontaneous human combustion. Kaoru Utsumi, the rookie police investigator assigned to this case, seeks help from Manabu Yukawa, an associate professor of Teito University. The two begin their investigation and discover the dark truth behind this murder.