Looking to escape the confines of an arranged marriage on her home planet, Freyja Wion stows away on a cargo ship, hoping to follow her dreams and audition for the Walkure Tactical Music Unit. She's discovered by Hayate Immelmann, a young dock worker and drifter with no particular dreams of his own. After an outbreak of the deadly Var Syndrome strikes, the Walkure Unit appears on the scene, and the power of Freyja's music is awakened.

**NOTE**: This is a "New Year's Eve Special Preview" version of Episode 1 that aired on 2015-12-31. It was only 89% complete at the time of airing, hence the title "Mission 0.89." The creators noted that there is more to this episode after the final scene.

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故事讲述了西历2067年，在人类会失去自我并泼辣化的怪病——"狂暴化症候群"蔓延的银河边境之地。 而作为对抗手段而结成的战术音乐组合「WALKÜRE」为了以歌声平定"狂暴化症候群"——她们在星球间奔走、展开着现场演唱会活动。 另一方，同时，被称为「空中骑士团」的「风之王国」所属瓦尔基里部队开始了举动——。 围绕着史前文化遗产之谜，超越星系的热烈团队协作与爱情故事拉开了帷幕。

超时空要塞DELTA：激情的女武神 BD内含SP小剧场