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

1996 04.17	Senobi wo Shite Follow You (TYDY-2065)	Song
1996 06.12	Sawanoguchi Sae (TYDY-2073)	Song
1999 07.16	Over The Rainbow (TYDY-2124)	Song
1999 08.06	Don't Love ()	Song