[1998.04.29][single] Aishiteiru Kara
[1998.05.21][single] Ai no Field
[1998.11.18][single] Tears in Love
[1999.06.17][single] Arigatou
[1999.07.16][album] songbird
[2000.09.21][single] RK Standard feat. KOKIA - Melody
[2001.05.23][single] Tomoni
[2001.08.22][single] Say Hi!!
[2001.09.13][single] Say Hi!! (Asian Mix)
[2001.11.21][single] Tenshi
[2002.01.23][album] Trip Trip
[2002.01.23][single] Ningen-tte Sonna Mono ne
[2003.05.21][single] Kawaranai Koto ~since 1976~
[2003.09.24][single] The Power of Smile
[2003.11.12][album] Remember Me
[2004.04.21][single] So Much Love For You
[2004.06.23][single] Yume ga Chikara
[2004.07.21][album] Uta ga Chikara
[2004.09.xx][single] Tokyo Toyota Original CD - Smile & Heart
[2005.02.23][single] Dandelion
[2005.07.21][single] Time to Say Goodbye
[2005.12.xx][single] A Piece of Christmas
[2006.01.01][single] Ai no Melody
[2006.02.01][best] Pearl ~The Best Collection~
[2006.11.29][album] Aigakikoeru
[2007.03.16][single] Arigatou
[2007.05.23][album] Aigakikoeru
[2007.09.16][single] Watashi ni Dekiru Koto
[2007.11.21][single] Follow the Nightingale
[2008.01.23][single] Tatta Hitotsu no Omoi
[2008.02.20][album] THE VOICE
[2008.09.24][album] Fairy Dance ~KOKIA Meets Ireland~
[2008.11.12][album] Christmas Gift