The world is in the isolation state. The reason is related to the mysterious deep-water entities that the navy called the "deep-water fleet" and which seas are captured, isolating all the countries of the world from each other. Refusing to sit back and allow a deep-sea fleet to get off his hands, all countries of the world unite their resources to create new weapons to combat them ... Weapons comparable in power with lincard weapons ... and his name: The Fleet Girls. Will this new weapon be enough to combat the deep-sea fleet? Will the ensign, just sent to the naval base, where the "fleet girls" are stored, help in their struggle ... only time will tell when this war against the deep-sea fleet will begin to develop?