The tranquility and order of Iron Blood were abruptly shattered by the emergence of an enigmatic and formidable threat originating from the Sirens. At that moment, humanity's future seemed bleak and its existence on Earth appeared doomed. However, a breakthrough came in the form of the newly discovered wisdom cubes, which bestowed immense power upon the former ships and were entrusted to each founding nation. In a remarkable display of unity, the Shipgirls, armed with unprecedented firepower, joined forces with the most brilliant tacticians, ensuring the survival and continued presence of humanity. Yet, victory in battle was not enough to satisfy humanity's insatiable thirst for superiority. As a result, a civil war erupted between two factions: Azur Lane and the Crimson Axis. Amidst the ensuing chaos and pervasive uncertainty, a signal, brimming with significance, reverberated across the Atlantic. U-556, a submarine , intercepted this signal and stumbled upon a figure of immense power and authority, a true leader among leaders.