Kouichi appears (sings/talks) in the following miscellaneous CDs.

1989 01.11	Sonic Soldier Borgman The Last Gig of the World (LD32-5093)	Song
1990 06.21	20 Mensou ni Onegai (VICL-3001)	Talk
1990 11.21	Everybody's Christmas	Song
1991 02.25	Oshare Maruhi Shirei Let's Go Seiyuu Daisakusen (SHCU-1001)	Talk
1991 07.21	Ningyo no Mori Original Soundtrack (VICL-177)	Talk
1991 08.21	Banana Fritters (MECH-30014)	Song
1991 08.21	CLAMP drama CD Combination (KICA-62)	Talk
1991 10.21	Shurato Celestial Warriors Battle for Genesis (KICA-70)	Talk
1991 11.21	Kirameku Umi wo Koete [Banana Fritters] (MECH-30020)	Song
1991 12.04	Monster Maker (VICL-249)	Talk
1991 12.21	Ranma 1/2 Kakutou Karuta	Song
1992 06.05	Hold You Tonight (KICA-113)	Song
1992 08.21	Banana Sensation [Banana Fritters] (MECH-30031)	Song
1992 10.28	92 Seiyuu Graffiti	Song
1993 06.20	Aa Megami-sama Tokuten-ou	Talk
1994 08.25	Yuugen Kaisha (PICA-1045)	Song/Talk
1994 11.23	94 Seiyuu Song Festival	Song
1995 01.20	DoCo Original Karaoke	BG Vocals
1995 07.21	Banana Best Selection [Banana Fritters] (MECH-28001)	Song
1995 09.25	Emerald Dragon vol 4 (PSCR-5410)	Talk
1995 12.21	Tokyo Denki Kirakira Gasshoudan The Heros (TDCD-1123)	Song
1996 12.21	Mothra '61 (COCC-13973)	Talk
1997 05.21	Voice Actor Best Song Collection 90 (APCM-5101)	Song
1997 05.21	Voice Actor Original Drama Collection II (APCM-5103)	Talk
1997 07.18	Bouken Radio Movie 1	Talk
1997 09.19	Bouken Radio Movie 2	Talk
1997 11.10	Seiyuu Grand Prix Special CD 97	Talk
1997 11.19	Bouken Radio Movie 3	Talk
1999 09.08	Jane Oferinaito (MACA-2011)	Talk
2000 12.20	Ah! Megami-sama! Tokuten-oh+ (PCCG-559)	Talk
2006 03.10	Tales of Destiny Chijou-hen (FCCT-9003)	Talk