Mangas

Senhime Zesshō Symphogear, Senhime Zesshou Symphogear
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 fights the Noise alone, Hibiki ends up gaining the same power as Kanade.
戦姫絶唱シンフォギア -  戰姬絕唱SYMPHOGEAR -  Senhime Zesshō Symphogear -  Swan Song of the 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.