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

2002 12.28	Popotan Maxi Single (Nakid)	Song
2003 01.22	Mouse Chu Mouse (LACM-4083)	Song
2003 01.22	Mouse chu Mouse [Under17] (LACM-4083)	Song
2003 06.27	Poporaji no Uta [tokuten CD] (BCBA-1665)	Song
2003 08.06	Popotan EP (LACM-4099)	Song
2004 07.22	Love Slave [Under17] (LACM-4135)	Song
2004 08.25	Kujibiki Unbalance [Under17] (LACM-4144)	Song
2004 10.11	Motto Yume Miyou [Under17]	Song
2005 07.27	Ton Dol Baby (LHCH-1013)	Song
2005 10.19	Wonder Momo-i (COCC-15804)	Song
2006 11.01	Koi Hajimemashita! (AVCA-26011)	Song
2006 11.22	Ippo zutsu [Nonomiya Mai] (AVCA-26014)	Song
2006 12.06	Yume no Baton (AVCA-26020)	Song
2007 03.28	21 Seiki (AVCA-26194)	Song
2007 08.22	Dan Dan Dan (AVCA-26420)	Song
2007 10.24	Yuuen no Amulet/Opera Fantasia (ZMCZ-3683)	Song
2007 10.25	R G B... (FPB-0013)	Song
2007 11.14	High Energy (AVCA-26561)	Song
2007 11.14	Rumika (AVCA-26537/B)	Song
2008 07.23	Yells -It's a Beautiful Life- (EVSC-1003)	Song
2008 08.27	Feel So Easy (AVCA-26889)	Song
2008 10.29	Zettai Otome (AVCA-26917)	Song
2008 12.28	Chicchana Bouken (PAM-0072)	Song
2009 01.30	Kakehashi (AVCA-26966)	Song
2009 08.22	Ai no Medicine -Anisama Version- (AKCS-1004)	Song
2011 04.20	Morobito Kozoite (AVCA-29920)	Song