Here's PV2 with more details on the cast and staff.
Aki Toyosaki as Falma de Médicis
Kaede Hondo as Charlotte "Lotte" Soller
Kenji Nomura as Bruno de Médicis
Maria Naganawa as Blanche de Médicis
Reina Ueda as Eléonore "Ellen" Bonnefoi
Shizuka Itou as Queen Elisabeth II
Director: Keizou Kusakawa (directed several Diomedéa projects)
Series Composition: Wataru Watari (yes, the one behind Oregairu)
Script: Wataru Watari
Original creator: Liz Takayama
Original Character Design: keepout
Character Design: Mayuko Matsumoto