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

1994.01.25	Fire Emblem (MWCG-0007)	Talk
1994.05.25	Sword World: Inishie no Kyojin Densetsu 1 (DPCX-5030)	Talk
1994.06.25	Sword World: Inishie no Kyojin Densetsu 2 (DPCX-5031)	Talk
1994.07.25	Sword World: Inishie no Kyojin Densetsu 3 (DPCX-5032)	Talk
1995.06.10	Wedding Dress ni Akai Bara 1 (TKCA-70637)	Talk
1995.09.21	Sotsugyou Crossworld "Sotsugyou M" (COCC-12878)	Talk
1996.01.20	Girl (COCC-18105)	Song
1996.06.05	Marriage -Kekkon CD Cinema 1 (VICL-8194)	Talk
1996.10.23	Souryuuden I Chounouryoku 4 Kyoudai (KICA-7011-7012)	Talk
1996.12.21	Oretachi ni Makasero! (COCC-13982)	Talk
1997.01.10	E.M.U. Equal (COCC-14020)	Song
1997.01.21	Oretachi ni Makasero! volume 2 (COCC-14019)	Talk
1997.03.20	E.M.U. Equal Live Tour (COCC-14053-14054)	Song
1997.04.19	Oretachi ni Makasero! volume 3 (COCC-14159)	Talk
1997.09.25	Money Idol Exchanger	Talk
1997.10.21	Oretachi ni Makasero! volume 4 (COCC-14581)	Talk
1997.10.22	True Love Story drama CD vol. 4 (WDCD-28015)	Talk
1998.01.21	Sotsugyou M Drama Collection (COCC-14774)	Talk
1998.03.04	Nekomusume Songs Manekigaoka Gakuenhen (KICA-394)	Song
1998.08.21	E.M.U. the Remix (COCX-30008)	Song
1998.10.01	E.M.U. the Best (COCX-30061)	Song
1998.12.16	Mahou no Stage Fancy Lala Final Best Selection	Song
1998.12.19	Sotsugyou M Song Collection (COCX-30225)	Song
1999.04.21	Kafuka (MMCM-7001)	Talk
2000.03.24	Yasha (PICA-1203)	Talk
2000.04.21	E.M.U. Memorial Box (COCX-30832--COCX-30836)	Song
2001.09.26	Wild Adapter (MMCC-4022)	Song/Talk
2006.03.10	Tales of Destiny Chijou-hen (FCCT-9003)	Talk

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

1997.07.19	Mountain (COCC-14455)	Song
1997.11.01	Sotsugyou M voice message Katou Yuusuke (CODC-1355)	talk
1998.06.24	Jewelry Love (TYDY-2117)	Song
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 5 ()	Song
2001.12.05	I.D.E.A. (CPDA-1017)	Song