Tsubasa Kazanari and Kanade Amou, the idol duet Zwei Wing, use their songs to power ancient weapons known as "symphogears" in order to confront a dangerous extraterrestrial species known as the "Noise." While the general public is aware of the Noise's existence, knowledge of the symphogears is kept hidden. Kanade sacrifices herself to defend a little girl called Hibiki Tachibana when the Noise assault one of Zwei Wing's performances, leaving Tsubasa distraught and a portion of her symphogear lodged within Hibiki.