UFO Ultramaiden Valkyrie 2: December Nocturne

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 whos only goal is stealing Kazuto for herself. As they team up against this seeming unbeatable foe they dig deeper into the mysterious past of Valkyries home planet, Valhalla.

(Source: Anime News Network)