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

1997 05.21	Mecha Hajikete Guts Tobashite (TYDY-2085)	Song
1997 07.19	Mountain (COCC-14455)	Song
1997.08.??	Cage II	talk
1997 11.01	Sotsugyou M voice message Arai Tougo (CODC-1352)	talk
1998 12.01	Heart ha Koukiatsu [E.M.U.] (CODC-1673)	Song
1999 05.01	Sotsugyou M character CD special 1 ()	Song
1999 05.01	Sotsugyou M character CD special 2 ()	Song
2003 07.02	Tokimeki Memorial Girl's Side Clovers' Graffiti 1 (KMCM-23)	song