[At the age of eighteen, just debuted as a pirate, you met the current overlord of the sea in the pirate world, Rocks D. Zibek. Now what you have to do is to find a way to survive in his hands. 】

After traveling back to the pirate world for seventy years, the great pirate Monger, who was ready to retire, looked at his system that was seventy years late.

And the intern in front of him who just turned twenty, hasn't even learned how to be domineering yet, and is working diligently on his own ship.

Reach out your hand.

Bang!

"Captain, what are you doing!?"

"Nothing, I just want to beat you up."

[Ding~, congratulations on defeating the overlord of the sea, Rocks D. Gibeck! 】

...

This book is also known as - "As a Pirate, You Get Younger and Younger"

"How Can You Lose When All the Crew Are Royal-Class? 》

Become...

[Arrived at Raftel at the beginning] [Shanks and Buggy's lifelong enemy] [Black Gun Red Hair Clown King] [Observation Kill + Tyrant + Sea Stone Bullet] [Do Not Move Fruit Ability User] [Supreme Big Pants]...

Throughout his life as a pirate, Oss's achievements are countless, but the real turning point of his fate is the desperate cry in his childhood,

"Kid, why do you have to board our ship?" The man who hid the great secret treasure at the end of the sea, the Pirate King Gol D. Roger smiled and asked Oss in front of him,

"Hahahahaha... Of course it's to turn the world upside down!"

After boarding the ship, Roger was shocked to find that he seemed to have another monster-like kid crew member, whose

strange power far exceeded that of the giants? Born with awakened observation Haki!...