On the beautiful island of Asca, there is a legend that thousands of years ago, the islanders were extremely afraid of the red full moon. In order to dispel the panic, God gave the king's shield and seven-star sword to the island, but when the seven-star sword and the red full moon appeared at the same time, darkness would dominate the earth. The Straw Hat Sea Thieves who temporarily settled on the island of Asca were hunted by the navy, while Sauron, who used to guard the ship, mysteriously disappeared. At Nami's insistence, everyone returned to the island, but came to a strange place, and then met the beautiful girl Maya with three beautiful jade. On the other hand, Sauron reunited with his ally Saka at the naval dojo on the island. Because of Maya, Sauron and Xiangji got into a big fight. And all this has something to do with the seven-star sword held by Saka. The secret of this legendary sword gradually surfaced.