Kumiko appears (sings/talks) in the following CD singles.

1997 03.21	Hanasaku Otome (BVDR-1153)	Song
1997 12.18	Grandia reservation special CD	talk
1998 07.17	Tenshi no Egao [Melody Sinclair] (PCDB-013)	Song/Talk
2001 11.21	Kiseki no Kane (AVCA-14248)	Song
2008 03.26	Waratte Waratte (WWCE-31156)	Song
2011 02.23	Ai ga Kaoru koroni (WWCE-31245)	Song