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