Born into a world 1000 years in our future, Saki and her friends live in utopia. Not only is their idyllic community overflowing with resources, but technology is obsolete, thanks to a magical power that grants the ability to materialize anything. However, when Saki discovers a lost artifact, the facade is shattered! Faced with a startling truth about their town, Saki and her companions face dangers they never knew existed, and their choices may change the fate of everyone.

During a concert by idol group Zwei Wing, an alien force known as the Noise attack the stage. Group members Tsubasa Kazanari and Kanade Amou suppress the attack using their Symphogear armor, but despite their best efforts, innocent bystander Hibiki Tachibana is fatally injured. Distraught and much to Tsubasa's dismay, Kanade sacrifices herself in the process to save Hibiki.

Two years later, Hibiki lives on. Tsubasa now fights alone. With the threat of the Noise increasing, Hibiki finds herself encountering the Noise once again but this time she is granted a chance to become attuned with the same Symphogear that Kanade wielded.