NA Localization:
"This is the final battle.
Once again, we'll swoop in to save the world in a blaze of glory!"
In the near future, the earth is threatened by unknown life-forms.
The only weapons with the power to fight back, all-purpose bipedal exo-suits, have been entrusted to the group of wandering space warriors called the "Chivalric Order of Fianna."
...And these are their ace pilots.
Humanity's future is on the line. The final assault begins now.
Fan Translation:
"Nah, this is the last battle.
As usual, let's magnificently save the world!
In the near future, the Earth endangered by a mysterious lifeform.
Only a certain all-purpose bipedal armor had the power to withstand it,
entrusted to an independent force known as "Fionna Knights"
―――They are known as the strongest Ace pilot.
The last fight that puts the future of humanity at stake starts now.