UFO Princess Valkyrie 2: Juunigatsu no Yasoukyoku

UFO Princess Valkyrie - December's Nocturne

UFO Princess Walküre 2

UFO Ultramaiden Valkyrie 2: December Nocturne

円盤皇女ワるきゅーレ 十二月の夜想曲

Valkyrie, Kazuto, Akina, Hydra, and friends are back for more when the Key of time suddenly appears along with many other mysterious happenings. All seemed to be linked to a person named "Valkyrie Ghost" whose only goal is stealing Kazuto for herself. As they team up against this seeming unbeatable foe they dig deeper into the mysterious past of Valkyrie's home planet, Valhalla.

(Source: ANN)