Machiko has done the following roles in audio drama.

Aoyama Nichoume Gekijou [Radio] {8 Gatsu no Serenade}	Tanabe Yuka
Boys Be... [Magazine DD Book]	?
Dark Sabre [CD]	Chisato Komachi
Gakkou de atta kowaihanashi S Original Sound Horror [CD]	?
Himikoden -Renge- [CD]	Ue
Hyper Securities [CD]	?
Kamaitachi no yoru [CD]	Shinozaki Midori
Kouyasai -Matsuri no ato- [CD]	Saionji Akane
Makeruna! Makendou [CD]	?
Megami Ibunroku Persona [CD]	Ayase Yuka
Money Idol Exchanger [CD]	LeLoura Franc (Cherrybaiter)
Planet Ladder [CD]	Haruyama Kaguya
Radish Roxs [CD]	Takahashi Izumi
Sangokushi DX [CD] {DX 3,5}	?
Sei License -Hide & See [CD]	Cornelia
Sekai Meisaku Ehon [CD] {Volume 2, Track 2}	?
Sekai Meisaku Ehon [CD] {Volume 2, Track 4}	?
Sekai Meisaku Ehon [CD] {Volume 6, Track 3, Ookami to 7 hiki no koyagi}	?
Sekai Meisaku Ehon [CD] {Volume 14, Track 1}	?
Sekai Meisaku Ehon [CD] {Volume 15, Track 2, Pinocchio no bouken}	?
Sentimental Graffiti [CD]	Sugihara Manami
Shin Mighting Machiko-sensei [CD]	Machiko
True Love Story [CD, Radio] {Vol 1}	announcer
True Love Story [CD, Radio] {Vol 1}	female student A
True Love Story [CD, Radio] {Vol 4}	Gotou Ikumi
True Love Story [CD, Radio] {Remember My Heart}	Gotou Ikumi
True Love Story [CD, Radio] {Short Episode Vol 1-3}	Gotou Ikumi
True Love Story [CD, Radio] {Misaki no heya ni o-i-de-yo Vol 1-2}	Gotou Ikumi
W (Double) Juliet Happy CD-Box [CD]	Ichikawa Misaki
W (Double) Juliet HCD [CD]	Kataoka Nobuko
Wrestle Angels [CD]	Echigo Shinobu