Rika has done the following roles in audio drama.

Aishiteru to ittekure [CD]	Yoshimine Taeko
Denshin Mamotte Shugogetten! [CD]	?
Senor Senorita [CD]	?
Sentimental Graffiti [CD] {Ano Hi no Mama no Kimi de Ite}	boy
Sotsugyou III [CD]	Saitou Yukari
Summon Night -Anohi no kakera- [CD]	Ruu
Time Leap [CD]	?
Uta wo kikasete [CD]	Saitou Masami
Voice Theater Series [CD] {volume 6}	?