Fics like Senki Zesshō Symphogear AFX: Knightfall

Shem-ha had been defeated, humanity had united under a common cause, and the Valkyries, who gave their all, were finally able to step forward into the bright future they'd created. But the peaceful days couldn't last forever, as a mysterious organisation known as Avalon rises up to challenge S.O.N.G and the seven Adaptors, seeking to tear them down and install a new world order. Seven stars struggle against the growing shadow, shining brightly in defiance, while one faces a deeper darkness from within.

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