The Key of Time
Valkyrie still lives with Kazuto. One day a giant wand-like object called “the Key of Time” appears before Valkyrie while she’s playing at the park. She starts helping others with the power of Key of Time and she keeps on using it without knowing its real power and purpose. Just as she helps Spot with the Key of Time, it goes out of control all of a sudden. It turns into a chaos involving the entire town.
Aired 03/10/2003EP 1 - The Key of Time
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)