An OVA:
星の海のアムリ
Hoshi no Umi no Amuri
Original Work, Director, Script: Yonetani Yoshitomo
Character Design, Modeling: MA@YA
Music: Kubota Mina
Animation Production: STUDIO HIBARI CG Team
Characters and their seiyuu:
Amuri: Makino Yui
Perrier: Saitou Momoko
Suzu: Aizawa Michiru
Maria: Noto Mamiko
Purumo: Matsumoto Marika
Ukatan: Kaneda Tomoko / Kobayashi Kiyoshi
A promotional video from Comic Market 72 can be watched here:
http://www.youtube.com/watch?v=75vfHNSoIJ0
Edit:
Added seiyuu :P though I'm not 100% sure about all anime character names >.<