I'm a Great Pirate, You Say I Just Set Sail?

[At eighteen, you've just debuted as a pirate, and you've encountered the current maritime overlord, Rocks D. Shiro. Now, what you need to do is figure out how to survive in his hands.]

Having transmigrated to the world of pirates seventy years ago, the great pirate Magnus, who was preparing to retire, looked at his system that was seventy years late.

And the intern in front of him, who had just turned twenty, hadn't even learned Haki yet, and was diligently working on his ship.

He reached out his hand.

Slap!

"Captain, what are you doing!?"

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

[Ding~ Congratulations on defeating the maritime overlord, Rocks D. Shiro!]

......

This book is also known as—In One Piece, Living Younger and Younger

How Can I Lose When All My Crew Members Are Emperors?

Be My Son, Roger!