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

1994.11.25	Fire Woman (TKCA-70534)	Talk
1995.12.16	Madara -Ao Gilgamesh Saga Vol. 1 (AFCP-2012)	Talk
1996.09.21	Zoku -Hatsukoi Monogatari Song Collection (BVCH-639)	Song {3}
1996.0?.??	Mahou Tsukai Tai! Original Soundtrack (TYCY-5510)	Song
1996.12.11	Mahou Tsukai Tai! no Bunkasai (TYCY-5534)	Talk/Song
1997.01.22	Wish drama album (VICL-5337)	Talk
1997.05.03	Kyuukyoku Parodius (KICA-7759)	Talk
1997.08.27	Mahou Gakuen Lunar! (TYCY-5542)	Talk
1997.08.27	Mahou Tsukai Tai! Koi to Mahou to Atarashii Uta (TYCY-5558)	Song
1997.09.22	Sub Chara SCAN (VICL-60080)	Song
1997.11.21	Aika vol 2 Sweet Emotion (COCC-14630)	Talk
1997.12.20	Yume de Aetara 4 (COCC-14744)	Talk
1998.01.24	Radish Roxs First Impact	Song/Talk
1998.07.24	Mitsumete Knight 1 Entrance (KICA-7881)	Talk
1999.03.03	Kakikuke Kikuko no Sasisuse Sonata (FSCA-10077)	Sing/Talk
1999.08.25	Mahou Tsukai Tai! Vocal Collection (TYCY-10023)	Song
1999.08.25	Mahou Tsukai Tai! to Sen'oku no Ai to Kyuukyoku no Uta	Song
1999.09.22	Little Lovers She So Game 3D Super Fantasy (VICL-60235)	Talk
2000.01.19	Yuukyuu Gensoukyoku 3 Perpetual Blue (PCCB-407)	Talk

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