Hokkaido Rensa Satsujin: Okhotsk ni Kiyu(1987)

A man's corpse is discovered near a sea wharf in Tokyo Bay. While the police investigates, a 2nd and 3rd murder occurs one after another. You begin your investigating with Shunsuke Saruwatari, a detective from the Kushiro station, and seek the truth to discover the criminal's motivation. An examination of the relation between the victims exposes a important details from the past.