She was a member of the J-pop voice acting group, Drops, until they disbanded. They were most well known for singing the ending theme to the anime Doki Doki School Hours although they did perform a couple of concerts one of which was released on DVD.
Kouda Mariko no Taisetsu ni Oboerumono no ga Issho nara Ii yo ne
Kore ga Sō na no ne, Koneko-chan
MBS Radio Ore-tachi Yattemāsu Getsuyōbi
Mō Sugu Ore-tachi xxx Yattemāsu
Nazo Nazo Dreamin'
Ore-tachi Yattemāsu
Ore-tachi xxx Yattemāsu
Ore-tachi xxx Yattemāsu Next
Shao & Taisuke no Kon'ya mo Sugo Getten
Tensai! Hayamimi Radio-kun: Kouda Mariko no Honjitsu mo Game Sanmai
Twinbee Paradise
Twinbee Paradise 2
Twinbee Paradise 3
TV Game Radions R
Uha Uha Daihōsō Anime Street
Ultra Mania Banzai
Voice of Wonderland
Other
CD Data FANet Artist Information: Kouda Mariko
Idol on Stage
Minna no Uta: Ame nochi Special
Music Jump
Music Voice: Seiyū Idol Daishūgō
Seishun Adventure: Majo-tachi no Tasogare
Yūshoku Banzai CX
Discography
Singles
Konami Music
Bokura no Suteki (written by Masami Tozawa/ composed by Katsuki Maeda) / Harmony (composed by Miki Matsubara), 1994
Mimikaki wo shiteiru to (written by Masami Tozawa/ composed by Toshio Kamei) / Dare no Sei demo nai Futari (written by Masami Tozawa/ composed by Miki Matsubara), 1995
Watashi ga Tenshi dattara ii noni (written by Yoshiko Miura, Mariko Kouda/ composed by Miki Matsubara) / Machibuse (written/composed by Yumi Matsutōya), 1996
Yume wa Hitori mirumono janai (composed by Miki Matsubara) / Owaranai Encore (composed by Akio Minami), 1996
Egao de aishiteru (written/composed by Tomoko Tane) / Dore dake aisareru ka janakute (composed by Miki Matsubara),1997
Kaze ga tomaranai (written/composed by Tomoko Tane) / Soba ni iru kara (written/composed by Mariko Kouda), 1997
Ame nochi Special (composed by Miki Matsubara) / Iidasenakute (composed by Uni Inoue), 1997
Looking For (composed by Marron Nagatsuki) / Ōzora no Achira e (composed by Tatsuya Nishiwaki), 1998
Cobalt (composed by Hideshi Hachino) / Sha-La-La~Futari~ (composed by Miki Matsubara), 1998
Taisetsu ni Omoerumono ga issho nara ii yone (composed by Marron Nagatsuki) / Ganbare! Rōnin (composed by Uni Inoue), 1998
Matte imashita (written/composed by Tomoko Tane) / Taiyō de ikō! (composed by Kaori Okui), 1999