Hey Karikichi :)
The Voice actors are currently as follows:
KIMIKO: Yahiro
SHIZUKA: Otowa Sakuya
BEATRIX: Miru Kurumi
KATASHI: Watari Zemi
NIKOLAS: Babaten
YOSHIKI: Ruhma
AI: Miru Kurumi
The links take you to their profession pages, however, they are logged to be accessed only by Japan. Hope this helps answer your question!