One Piece: I Rule the Seas with Ninjutsu

This is the story of Sean becoming the World's Strongest in the Pirate King world with the help of the "Naruto System."

Doflamingo said, "Sean is called the Black King because he's always scheming, always finding ways to make me eat my words."

The Empress said, "Sean won me over with his bearing and his schemes, but what I love most is his strength, including his strength in that department!"

Whitebeard said, "Was the Paramount War really that grand? No. Sean once launched a dark war that destroyed Marine Headquarters!"

Hawkeye said, "Everyone calls me Hawkeye, so I think we should call Sean a god. His eyes can see into anyone's heart!"

Dark King Rayleigh said, "This era is named after Sean."

Everyone knows Sean is a good guy... He only wrecked a few islands, after all, even if those included Marineford and Mary Geoise...

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.