[One Piece + Rumble-Rumble Fruit + swordsman + justice + freedom + conquest]
Transmigrate into the world of pirates, starting from a floating island!
From the start, he is forced to eat a Logia Rumble-Rumble Fruit, a derivative of Enel's Rumble-Rumble Fruit!
I'll prove what lightning can do!
The Rumble-Rumble Fruit can be a top-tier Devil Fruit!
Let thunder shatter the darkness!
The protagonist is neither wholly good nor wholly evil. He does whatever he wants!
His guiding principle is to follow his heart!
See how he survives against the many powerful figures in the world of the Pirate King!
And writes a legend of his own!
If you are a newbie, I suggest you read more high-scoring pirate fanfics.