Gu Changtian accidentally travels to the world of One Piece and is bound to the One-Punch Man Summoning System. In the One Piece world, he establishes the First Legion and continuously accumulates shock points.

Such a terrifying demon has crossed over into the world of One Piece. What will become of the One Piece world...?

"The Warring States period was terrifying; the First Legion members were all like monsters..."

Whitebeard: "Giants are the strongest men in the world..."

Redhead: "Oh no, my pride isn't working anymore..."

Garp: "Even my iron fist can't beat the First Legion..."

Kizaru: "No matter how much money you offer me, I won't fight the First Army..."

Starting as a commoner in a collapsing ninja world, after twelve years of grueling ninja academy graduation, I'm sent to the battlefield as a mere line-filling doll? In this desperate situation, the system successfully activates. [Ding! Rare Pawnshop Across the Myriad Realms, at your service.] [Rare "Uzumaki" bloodline detected...] [Pawn?] You mean rare means pawnable, and rare means valuable, right? Then let me ask you, how many clans were wiped out by Yoru in the Naruto world? I can confirm three: Uzumaki, Kaguya, and Uchiha. Why? Because I was involved in all of them, so of course I can confirm it! After all, my current name is 'Namikaze Uzumaki Kaguya Uchiha Yoru'.