Azur Lane: The Animation

USS Enterprise:
"We look like humans, but we are powerful weapons. This is the mental cube. They're mysterious crystal substances acquired by humanity through their battle against the sirens. They are also the foundation upon which we were created. Filled with their power, we have the strength to fight the sirens. It is the power of warships, strong enough to tame an ocean and silence sirens. Humanity reclaimed the seas with the help of the mental cubes, but it wasn't enough. Some people wanted more and alliances eventually split. One side was called the red axis, this included the Sakura Empire and Iron Blood. Due to their desire to acquire the siren's power for themselves, they raised a rebellion against Azur Lane. Even when facing a common threat; the sirens, conflict between human factions continues. The truth is; war never changes. It's exactly the same, no matter the era."