Pirate's Zenith! Starting as a Roger Pirates Intern

Throughout his life as a pirate, Austin has achieved countless feats. But if we're talking about the true turning point of his destiny, it would have to be that earnest shout in his youth,

"Brat, why do you have to join our crew?" The man who hid the greatest treasure at the end of the sea, Pirate King Gol D. Roger, asked Austin with a smile.

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

After joining the crew, Roger was shocked to discover that he seemed to have gained another monstrous cabin boy.

Strength far surpassing the giants? Innate Observation Haki awakening!?!

Thus, Austin, who successfully navigated his way ashore with high emotional intelligence, displayed an incredible learning ability in Haki, marksmanship, swordsmanship, and hand-to-hand combat, while also becoming the closest friend to Shanks and Buggy.

......

On a calm and peaceful day, an uninvited guest boarded the newly set sail Merry. Everyone's eyes turned to the man carrying a black spear, a figure who only existed in legends.

"Want to know what the One Piece is? I'll tell you."

(Not a "following the ship" type of story)