Sailing the Seas as the Sixth Son of the Vinsmoke Family

The protagonist transmigrates into the world of One Piece and is born into the Vinsmoke family. He becomes the family's sixth son, a replacement for Sanji, the failed experiment.

But while carrying out the bloodline factor modification surgery, Judge unexpectedly learns that Fish-Man Island has a scale from a true dragon that fell from the stars tens of thousands of years ago.

Judge personally leads a group to secretly steal the sacred relic from Fish-Man Island: a scale from the Starry Sky Dragon.

He then extracts the Starry Sky Dragon's bloodline factor and uses it to modify the protagonist.

Years later, the protagonist looks at Big Mom and says:

"So you're Big Mom? You think you're good enough to become family with the Vinsmokes?"

"So you're Kaido? I heard you want to kill yourself. Let's see if you can take a punch from me."

"Monkey D. Dragon, want to join me in overthrowing the World Government? Then we'll let Germa rule the world."

Dragon looks at the protagonist and says, "Get lost. I'd sooner let the Celestial Dra..."

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.