Norio has done the following roles in audio drama.

Aa Megami-sama Tokuten Ou [CD]	Senbee
Aozora Shoujotai [CD]	Konishi Mitsuru
Aozora Shoujotai [CD] {Saraba Shimo Ranger}	narrator
Den'ei Shoujo Video Girl Ai [CD]	mysterious man
Dog Days [CD]	Godwin Dorure
Ganbaru Sentai Mare Ranger [niconico]	?
RG Veda [CD]	Teishakuten
Vampire Hunter [CT]	narration