Comic Blade Drama CD Series: EREMENTAR GERAD Vol.1
Note cast is NOT the same as the anime
Coud - Takahashi Naozumi
Rev - Kuwashima Houko
Cisqua - Ohtani Ikue
Rowen - Morikubo Shotaro
Kuea - Okamura Akemi
Gouri Daisuke is most likely the Pirate Captain, I can't remember his name.