A girl named Hibiki Tachibana attends a concert held by Tsubasa Kazanari and Kanade AmÅ, who form the pop duo, Zwei Wing. In the middle of the concert, the stadium is attacked by an alien race known as Noise who begin killing the attendees. Tsubasa and Kanade summon mechanical battle armor known as Symphogear to fight off the Noise, but soon find themselves in a pinch. As Kanade tries to protect Hibiki, a stray fragment of her armor comes off and hits Hibiki...