Ao no Corsair (Volume)

is the first volume of the Ao no Corsair light novel series, written by Sadato Taube and Illustrated by nyoro. It was released under the Dengeki Bunko Imprint in November 2015.

Synopsis
A new legend of the Dragon Emperor begins! In order to regain the life of the stolen sister, the boy pirate goes to the sea where the strong man waits- After the death of the dragon emperor of Atlantis, the power of the sea, the world has transformed into a "pirate era" in which powerful pirates are slaughtered. The pirate Van, who inherited the "Dragon Emperor Sword" that leads the Lord to Atlantis, sets out for Atlantis in search of Atlantis, where the mystery of his life sleeps, in order to regain the life of his sister who was robbed in the war. Meanwhile, Van encounters the pirate Silver Arm family and decides to kill each other with a great swordfighter. However, the swordfighter is a princess of the North Sea Vanishia who has some circumstances ...!? A large marine adventure action where a boy pirate with the power of the dragon emperor goes around the "hidden treasure" on the sea stage!

(source: Dengeki Bunko Official Website - Translated)