Houko has done the following roles in audio drama.

Argent Soma [CD]	Harriet Bartholomew
Beast of East [CD]	?
Clannad [CD]	Sakagami Tomoyo
Cobalt Tokimeki Drama CD Remix [CD] {Maria-sama ga Miteru}	?
Cutie Tenshi (Angel) Chougouka Yume no Saiten [CD]	Mikoto
Dangaizer 3 [CD]	?
Dear My Friends -Shaberasete Misemashou- [CD]	?
The Drama Side of Apocripha/0: Blue Tail in the Cross [CD] {Volume 1-2}	?
Hayate X Blade (Hayate Cross Blade) [CD]	Asakura Mizuchi
Kami-sama ga Ippiki [CD, Radio]	?
Kidou Senkan Nadesico Oshare Club [CD]	Misumaru Yurika
Macross Frontier [CD]	Matsuura Nanase
Macross Frontier [CD]	Kanaria Belstien
Megami Ibunroku Persona [CD]	Sonomura Maki
Metal Gear Solid [CD]	Mei Ling
Minaguchi Yuko no Dear My Friends -Shaberasetemisemashou- [CD]	?
Money Idol Exchanger [CD]	Cecil Pound (Eldilabor)
Mugen no Ryvius (Infinite Ryvius) [CD]	?
Neko na Kankei [CD]	Sakamoto Chiharu
Planet Ladder [CD]	Serenanede
Ren'ai Catalog -Tiny Darling Cupid- [CD]	Tane
Shining Force Exa [CD]	Shiriru
Sora no Kiseki the 3rd -Tamashii no kokuin- [CD]	Liisu Algent
Summon Night -Anohi no kakera- [CD]	Ameru
Summon Night -Kai no hazama no yurikago- [CD]	?
Tales of Symphonia [CD]	?
True Stories [CD]	Hotaru
True Stories [CD]	Touko
True Stories [CD]	Mizuki
Yuukyuu Gensoukyoku Ensemble volume 1 [CD]	Cheryl Kurisutia