One Piece: From Marines' Errand Boy to Toppling the World Government

A young man from Blue Star transmigrates by accident to the world of Pirate King, where he becomes a low-ranking Marine. He expects a passionate adventure, only to discover that the road ahead is full of hardships.

Fortunately, he gains the “Limit Breakthrough System.” Built around Blue Star sports science, it quantifies the growth of his abilities and generates personalized training plans. With the System’s help, he starts by mastering basic combat techniques, then gradually learns the Marines’ Six Powers, awakens the Three Types of Haki, and trains in swordsmanship.

He takes part in major battles such as Enies Lobby and the Paramount War, constantly honing himself in real combat and making plenty of enemies along the way. To realize the justice he believes in, he joins forces with like-minded companions and challenges the corrupt World Government. Overcoming one obstacle after another, he rises from an unknown Marine foot soldier to the position of Fleet Admiral.