Decades after humanity's supposed defeat of the Sirens, different blocs have formed in the world with old enemies allying with each other. But will this new peace last or is humanity doomed to repeat the mistakes of the past?

BB-61, flagship of the Seventh Fleet, after fighting the last battle of the Siren Wars is reported MIA. No one knew what actually happened to the ship and most assumed it was sunk in the nuclear blast that killed the Sirens. This is the story of that ship and its second chance.