Houko appears (sings/talks) in the following CD singles.

1996.10.23	You Get To Burning/Watashi Rashiku (KIDA-137)	Song
1997.02.21	Feel For Love -Ai wo Sagashite-	Song
1998.08.07	Believe/Kono Kumo no Eien no Youni	Song
1999.01.20	Ko-Ko Paradise [PPP]/Fly Over to You (ZMDZ-147)	Song
1999.11.10	Toki Hanate! (TYDY-2127)	Song
2003.12.17	Warukyuure Character Maxi 7 (COCC-15609)	Song
2007.11.28	Bamboo Beat (VTCL-35010)	Song
2010.02.17	You Get To Burning (KICM-3202)	Song
2010.10.27	Power of Shine (MJCD-23092)	Song