Writing Isao Matsumoto Biography Isao Matsumoto is a former Japanese film writer. Other Credits King of Sha-kin 4 Screenplay 1998 King of Sha-kin 3 Screenplay 1998 King of Sha-kin Screenplay 1997 Mad Dog Screenplay 1994 The Fighting King 2 Screenplay 1994 The Fighting King Screenplay 1994 Dark Society in the East Screenplay 1993 Nakibokuro Screenplay 1991 Lonely Hitman Screenplay 1989 Love on a Daily Basis Screenplay 1988 Crazy Boys Screenplay 1988 Those Swell Yakuza Screenplay 1988 Double Rope Torture Screenplay 1985 The Shogun's Vault IV: The Gold Mines of Sado Screenplay 1983 The Blazing Valiant Screenplay 1981 Nun Story: Frustration in Black Screenplay 1980 The Shogun Assassins Screenplay 1979 Rope and Skin Screenplay 1979 The Okinawa War of Ten Years Screenplay 1978 Golgo 13: Assignment Kowloon Screenplay 1977 Agent-readable