At the end of the Ming Dynasty, Lin Xiao, a Ming naval officer who has returned to his hometown after a shipwreck, accepts a call from the naval officer Xiang Ji in order to stop the Japanese pirates from getting the "God's Machine Arsenal" and to find his missing comrade Lu, and once again embarks on a treacherous treasure hunt. The mysterious sea monster group, which is vicious and bloodthirsty, and the greedy and cunning pirate organization are also targeting Lin Xiao's ship.