Reversing the Yellow Springs

Calamity descended, swallowing the world.

Humanity used its last strength to raise towering walls and build great cities, preserving the final sparks of life.

Now, the calamity stirs once more.

Humanity will go from defending to attacking!

Witness heroes, learn from heroes, become heroes!

(Action-packed, post-apocalyptic, multiple heroines. Please don’t complain if it’s not your thing.)