Senki Zesshou SymphogearSenhime Zesshō Symphogear; Senki Zessho Symphogear; Swan Song of the Valkyries: Symphogear; 戦姫絶唱シンフォギア; 戰姬絕唱SYMPHOGEAR; La Superbe Chanson des Valkyries: Symphogear

From Wikipedia : Two years ago, a pair of idols, Tsubasa Kazanari and Kanade Amō, collectively known as ZweiWing, fought against an alien race known as Noise using armor known as Symphogear. To protect a girl named Hibiki Tachibana, who got severely wounded by the Noise, Kanade sacrificed herself. Two years later, as Tsubasa has fought the Noise alone, Hibiki ends up gaining the same power as Kanade.