One Piece: System-Rewarded Rumble Fruit

Upon transmigrating into the One Piece world, the protagonist finds himself in Foosha Village, where a mysterious system immediately rewards him with the formidable Rumble-Rumble Fruit (Goro Goro no Mi). With this ultimate power at his fingertips, he begins his journey by establishing a base in the wilderness, building a treehouse, and honing his abilities. His path soon crosses with a young Monkey D. Luffy, Portgas D. Ace, and Sabo, and together they forge an unbreakable bond of brotherhood. As he grows stronger through the system's missions, he sets his sights on the Grand Line, determined to carve his own legend and become the strongest force the world has ever seen.