Ryoutarou has done the following roles in audio drama.

Barbarian Quartetto [CD]	?
Beast of East [CD]	?
Calm Breaker [CD]	Sakazaki Toshiya
Choujin Gakuen Goukaizer [CD]	Shikure Kyousuke
Clannad [CD]	Furukawa Akio
Cutie Tenshi (Angel) Chougouka Yume no Saiten [CD]	Rikimaru
Cyber Formula Saga II [CD]	Franz Heinel
Di Gi Charat [CD]	Murataku (Kimura Takurou)
Eiyuu Densetsu III -Shiroki Majo- Kenketsu Hen [CD]	Badatto
El Hazard [CD]	Jinnai Katsuhiko
Fortune Quest Gaiden [CD]	Cray
Fruits Basket [CD]	Soma Shigure
Gekka Kajin: Lumen Lunae [CD]	?
Ginga Sengoku Gunyuuden Rai [CD] {Volume 3}	?
Guy Brave [CD]	Johnny
Hanasaki Komachi Girls [CD]	Sanjoukoji Mikihiko
Haoutaikei Ryuu Knight [CD]	Graches
Houshin Engi [CD]	You Sen
Hyper Anna [radio]	Sankouin Yasunari
Izanogi [CD]	Kinkaku
Jajauma Quartette [radio]	Kaitou Flakasso
Kamaitachi no yoru [CD]	Kubota Toshio
Megami Ibunroku Persona [CD]	Uesugi Hidehiko
Minna de tsukuru Yuukyuu CD! [CD]	?
Musekinin Kids [CD]	Shigechiyo
Popful Mail The Next Generation [CD]	Blackie
Rockman [CD]	Blues
Rockman [CD]	Robo 2
Rockman [CD]	Announcer
Sotsugyou Cross World All Stars On Stage [CD]	Takagi Shimon
Sotsugyou M Oretachi ni Makasero [CD]	Takagi Shimon
Sotsugyou M+ (Male Graduation Plus) Final Drama CD -Oretachi no Sotsugyou- [CD]	Takagi Shimon
Super Robot Taisen alpha Gaiden [CD]	Raidiisu F Buranshutain
Tales of Destiny [CD]	?
Tengai Makyou [CD] {Volume 1,2}	?
Unjou Roukaku Kidan [CD]	Saishiden
Vampire Hunter [CT]	Donovan
Yuukyuu Gensoukyoku Ensemble volume 1 [CD]	Albelt Corraine
Yuukyuu Gensoukyoku THE BEST -Selected by Characters- [CD]	Albelt Corraine
Yuukyuu Kumikyoku All Star Project [CD]	Albelt Corraine