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

2000 09.21	Ren'ai Catalog -Tiny Darling Cupid- (LACA-5009)	Talk
2001 02.07	Sister Princess 12 Nin no Tenshi Tachi (KICA-532)	Song
2001 04.04	Prologue of Sister Princess Dear My Brother (KICM-3007)	Talk
2001 08.29	Sister Princess Original Soundtrack Angel Jukebox (KICA-552)	Song
2001 09.29	Sister Princess Kaleidoscope (KICA-556)	Song
2005 08.24	AIR vol 3 (FCCP-11)	Talk
2005 08.24	Air Drama CD vol 3 Touno Minagi Dream Zenpen (FCCP-11)	Talk
2005 10.21	AIR vol 6 (FCCP-14)	Talk
2005 10.21	Air Drama CD vol 6 Touno Minagi Dream Kouhen (FCCP-14)	Talk
2005 11.23	Mahou Shoujo Lyrical Nanoha A's Sound Stage 01 (KICA-733)	Talk
2007 08.08	Idol Master Xenoglossia Drama CD Vol. 2 (LACA-5673)	Talk
2007 12.12	Mahou Shoujo Lyrical Nanoha StrikerS Sound Stage 5 (KICA-856)	Talk
2007 12.21	Night Wizard The Animation Characters vol 4 (VGCD-0128)	Talk
2007 12.21	Night Wizard The Animation Characters vol 5 (VGCD-0129)	Song/Talk
2008 04.23	Night Wizard The Best Vocal Collection (VGCD-0137)	Song
2009 09.25	Princess Diva! (LACA-5963)	Song
2011 11.16	Kaitou Tenshi Twin Angel 3 Sound Collection (PCCR-90050)	Song
2013 07.10	Yahari Kono Chara Song ha Machigatteiru (GNCA-1375)	Song