Welcome to the world of Azur Lane! Set in the 20th century, in an alternate reality where, during World War I, the AI ​​Sirens invaded and attacked humanity with the goal of 'upgrading' it and preparing it for battle against the enemy 'X'. Having acquired the Wisdom Cubes, humanity formed the KAN-SEN project, transforming the ship's blueprints into humanoid female forms. Humanity formed an alliance—Azur Lane—to combat the Sirens. And you, Commander, Azur Lane's Commander.