Kouichi has done the following roles in audio drama.

Aa Megami-sama Tokuten Ou [CD]	Troubador
Bouken Radio Movie [CD]	Enjouji Tatsuma
Combination [CD]	Hashiba Shigemitsu
Fam & Ihrlie [CD]	Migel
Izumi Gensenki -Meidouhen- [CD]	Kisaragi Shirou
Outo Ayakashi Kitan [CD]	Fujiwara Masayuki
Photon [CD]	Papachariino
Sokkou Seitokai [CD]	Ohtani Kouichi