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

1999 12.27	Kira Kira Melody Gakuen Drama CD Super Flying Version (KIRA-1999)	Talk
2000 03.25	Kira Kira Melody Gakuen drama CD 1 (MACM-1080)	Talk
2000 04.28	Kira Kira Melody Gakuen drama CD 2 (MACM-1081)	Talk
2000 08.05	Kira Kira Melody Gakuen drama CD Dai Ichibu Kanketsuhen (KIRA-2000)	Talk