A little boy name, Y/n L/n, who's mother and father works at a naval dockyard anchoring WW2 ships. Each day he visits the yard after school to see the ships that were anchored there. He climbs aboard and pretends to be the captain of each ship But one day, some of those ships started to set sail to a secret facility that is classified and top secret. His parents tells their son that they are leaving and won't see them again. Until a natural disaster happens which resulted the Sirens attacking forcing humanity out of the sea. Years later, Y/n a young teen has been ordered to deliver a top secret package but was intercepted by the Sirens. Join on his journey as he fights against the Sirens and win the hearts of the few All rights goes to Azur Lane A fan-fiction male reader story