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

1999 11.03	Ai (Chuuseishin) [Excel Girls]	Song
2001 01.24	Melody (LACM-4004)	Song
2001 07.04	Egao ga No.1! Yapparine (KICM-3011)	Song
2003 12.21	Sister Princess Xmas Song Collection (KICM-3048)	Song/Talk