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

[Eighteen years old. Just as you debut as a pirate, you run into the current ruler of the seas in the pirate world—Rocks D. Xebec. Now, your only mission is to survive at his hands.] After seventy years of living in the world of One Piece, the great pirate Magnus, now ready to retire, stared at the system that had arrived seventy years too late. And at the twenty-year-old intern in front of him—who hadn’t even learned Haki yet—working diligently on his ship. He raised his hand. Smack! “Captain, what was that for!?” “Nothing. I just felt like hitting you.” [Ding~ Congratulations! You have defeated the King of the Seas—Rocks D. Xebec!] [Raw: 我大海贼，你说我刚出海？]