Handlung

Set during an alternative timeline of World War II, the player takes on the role of a Commander, commanding and maintaining a fleet of shipgirls. In the midst of an earlier worldwide conflict, a mysterious enemy named the Sirens emerged from the sea, devastating the divided nations of the world and causing humanity to lose more than 90% of its control over the sea. Decades later, deciding to unite against this enemy and reclaim the sea, the major nations of the world allied and created Azur Lane, a worldwide military organization.