Hiroko has done the following roles in audio drama.

Emerald Dragon [CD]	Thamrin
Next King -Koi no Sennen Oukoku- Gaiden [CD]	Fennel Nasturtium
Sei naru Shoujo no Uta [CD]	Kama Kimie
Shinsengumi Ibun Aoki Ookamitachi no Shinwa Ongaku Special "Makoto" [CD]	?
Yuukyuu Gensoukyoku "Yuukyuu Ongakusai" [CD]	?
Yuukyuu Gensoukyoku 3 Perpetual Blue [CD]	?