Ryo has done the following roles in audio drama.

Alien Kaibyouden [CT]	Miyagi Tsukasa
Aoi Gakuen Playtime [?]	?
Garland: Silent no Shou [CD]	Shido
GS Mikami [CD]	Yokoshima Tadao
GS Mikami Gokuraku Daisakusen!! [CD]	Yokoshima Tadao
Kimagure Orange Road Original [CD]	Kasuga Kyosuke
Landlock [CD]	Rodia
Lodoss Tou Senki [CD, CT] {Volume 1}	?
Makeruna! Makendou [CD]	?
Ring (CD Book) [CD]	Shimosawa Junji
Shining Force Exa [CD]	Lagunadarm III
Sotsugyou Crossworld [CD]	Shinjou Hayato
Wedding Dress ni Akai Bara [CD]	Tommy Akaiwa
Yankee Reppuutai [CD]	?