Transmigrating from birth into the world of One Piece, he became the World Government’s strongest talent in 800 years: the CP9 killing machine, Rob Lucci.

By all rights, this should have been the ultimate overpowered transmigration. But thinking of his future self—first sent to work as a shipwright in the trenches, failing the mission, then treated like a roadside nobody, and finally returning as a king yet still mocked as “the Ultimate Brother” by the world—Lucci felt his prospects were completely doomed.

Fortunately, fate is fair. After enduring a hundred blows from Kaido, destiny finally took a turn.

“Kid, come aboard my ship and become my crew!” The Governor of the Beasts, the strongest creature, and one of the future Four Emperors—Kaido—laughingly extended his fist toward the young Lucci.

Thus, boarding the Beasts’ flagship, Lucci proved to the world the true worth of the strongest talent in 800 years.

He faced Red-Haired Shanks head-on with fierce dominance.

Duels with Mihawk in swordsmanship.

Brawled with Garp in hand-to-hand combat.

…Years later. On a calm day, the newly set-sail Merry welcomes a legendary man aboard.

“Want to become the Pirate King? Fine! Survive, and I’ll let you be!”

Kyle's third time traveling through time brings him to a world far more bizarre and dangerous than those of One Piece and Naruto. The painful experiences of his first two journeys, where he died in swords and kunai upon inheriting his memories, taught him this: if you're not strong enough, you die! Awakening his Nen ability at the age of seven, he possesses the power to turn everything around—the Book of the Unique World Resonance! When Gon needs strength to challenge Hisoka, Kyle extends an invitation: "Sign a contract. I'll grant you the opportunity to train in another world, and you'll grant me the power to reflect back." Thus, the Hunter world's strongest pirate group sets sail, and an organization more powerful than the Akatsuki in the Ninja World is born. But Kyle harbors a deepest secret: does this seemingly fair contract reflect the fruits of training, or does it reflect the fate of the contracted... themselves? As the bonds of the powerful from three worlds intertwine, what awaits them is the path to the highest...