This is LuckyHighAce and Shadows's story. When the final battleship weren't built. To Royal Navy, to Sakura empire, to Ironblood, Northern Parliament, to Iris Libre/Vichya Dominion and to the Eagle Union. These battleship for supposed to last forever. AirPower come to play the battleship did not last forever. After that the powers canceling them. But one day. Battleships got a second chance to make sure that can keep the peace.