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

1995 03.22	Shinpi no Sekai El Hazard Ongakuhen (PICA-1053)	Talk
1995 03.24	Macross 7 Docking Festival -Uta ha ginga wo sukuu- (VICL-575)	Talk
1995 09.21	Jinnai no Sekai (PICA-1074)	Song/Talk
1995 12.21	El Hazard TV volume 1 (PICA-1082)	Talk
1996 01.24	Macross 7 CD Cinema 3 Galaxy Song Battle 1 (VICL-740)	Talk
1996 03.06	Macross 7 CD Cinema 4 Galaxy Song Battle 2 (VICL-741)	Talk
1996 04.03	Macross 7 CD Cinema 5 Galaxy Song Bettle 3 (VICL-742)	Talk
1996 05.10	El Hazard TV volume 2 (PICA-1100)	Talk
1996 07.24	Radio no Sekai El Hazard CD Special (PICA-1103)	Talk
1996 09.21	Macross 7 Trash (VICL-802)	Talk
1997 01.29	Battle Athletes Dai Undoukai (PICA-1125)	Talk
1998 02.25	Man'youshuu Kuro (PICA-1163)	Song
1998 05.22	Desire (KICA-1212)	Talk
1999 02.26	Daiundoukai GTO Original Drama (AZCA-10019)	Talk
1999 03.20	Bubblegum Crisis 2040 Collector's File 1999 (VICL-60239)	Song
2001 03.07	Pia Carrot he Youkoso! 2 DX Drama CD ()	Talk
2003 10.24	Cinematic Sound Drama GetBackers -Divine Revelation- (MKC-0001)	Talk
2004 02.14	Cinematic Sound Drama GetBackers -The Place of a God's Death- (MKC-0002)	Talk
2005 01.31	Cinematic Sound Drama GetBackers -Legend of Vampire- (MKC-0003)	Talk
2005 03.25	Cinematic Sound Drama GetBackers -Beast Howling- (MKC-0004)	Talk
2005 11.23	To Heart 2 Character Songs (KICA-1380)	Song/Talk
2006 01.31	Cinematic Sound Drama GetBackers -Bug's Karma- (MKC-0009)	Talk
2006 08.31	Cinematic Sound Drama GetBackers -The Origin- (MKC-0010)	Talk