With what they've learned from the shrine, the Symphogear Wielders now know the full extent of the Illumanti's plan: they're going to use an ancient gate to summon the power of a god. Only one person can stop them: Hibiki, the "God-Killer".

The divine power chooses Hibiki as its vessel. To stop the worldwide disaster she could cause, the U.N. initiates a wide-scale attack on Japan.