Chiwa has done the following roles in audio drama.

Cinematic Sound Drama GetBackers [CD]	?
Mitsudomoe [CD]	Sugisaki Miku
Pani Poni [CD]	Rebecca Miyamoto [1C]
Pani Poni Dash [CD]	Rebecca Miyamoto [1C]
Pani Poni Second Season [CD]	Becky
Raki Suta [CD]	Narumi Yui