Hiroyuki Kawasaki was a screenwriter and novelist and has a Series Composition credit on Psychic Detective Yakumo.
series composition
TV anime / 2010
TV anime / 1993
TV anime / 2008
script
TV anime / 1996
TV anime / 2011
TV anime / 2014
TV anime / 1995
script (eps 4, 5, 10, 21, 25, 43)
TV anime / 1992
TV anime / 2002
Short TV anime / 2003
OVA / 1999
TV anime / 2001
TV anime / 1990
TV anime / 2004
script (eps 6, 11, 16, 20, 24, 31, 36, 41, 48)
TV anime / 2015
script (eps 4, 9, 19, 24, 31, 35, 42, 46)
TV anime / 2016
OVA / 1994
OVA / 2003
TV anime / 2005
OVA / 2002
OVA / 2004
TV anime / 1989
Movie / 2015
TV anime / 1991
Movie / 2001
script (eps 3, 8, 13, 17, 23, 27, 31, 33, 38, 40)