The stage of the story is, unknown to us, a blue planet with 71% of its surface covered by water.
Alien enemies "Sirens" suddenly appeared from another world. In order to fight against these overwhelming foreign enemies, humans formed a global joint organization "Azur Lane" centered on the four major camps.
However, it may be because they have philosophical differences on whether they should use the power of the sirens, or it may be because they do not want to continue being ships and want to live as humans——
Some forces represented by the "Chongsakura Islands" and the "Iron-Blooded Principality" broke away from the "Azur Lane" and began activities as the "Red Axis".
In order to monitor the movements of the "Red Axis", "Azur Lane" established a new base in the ocean and gathered combat power.
The situation is on the verge of breaking out. No one knows the fate of the girls yet...
Intention: Intention to be added