Superb Song of the Valkyries: Symphogear

During a concert by the idol group Zwei Wing, an alien force known as the Noise attacks the stage. Group members Tsubasa Kazanari and Kanade Amou fight back using their Symphogear armor, but despite their best efforts, an innocent bystander named 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.