After transmigrating into the world of One Piece, Sephiroth begins a new life on these seas, carrying the memories of his swordsmanship from his previous life.
At twenty-one, he defeats Mihawk and becomes the new World's Greatest Swordsman.
Everyone thinks this young man will stay in the New World to challenge the strongest and stir up a storm.
Instead, he turns his ship around and returns to the weakest sea, the East Blue.
There, he finds a debt eight years overdue, a sea chart covered in secrets, and a girl who smells of oranges.
When Nami boards his ship with the sea chart in her arms, the voyage of the World's Greatest Swordsman truly begins.
[Single heroine: Nami | No System | No Devil Fruit | Overpowered protagonist | Free-spirited sailing]