Substitute Marriage: Reborn As The Top Big-Shot - Chapter 1062 - 291: It’s exhilarating to abuse the dregs for a moment, but amputation is needed!_2

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

High school student Mikoshiba Ryouma was summoned to a different world in the middle of a war. Sensing the malice from the one who summoned him (a summoner of the O’ltormea empire), he uses his martial arts to run away, killing important people of the empire during his escape. After the escape, he rescues two twin sisters from the hands of thieves. The sisters who can use magic, swear to serve him as subordinates. Thus, Ryouma begins his journey on the path of the supreme ruler.

Ron finds himself reborn in the world of One Piece, stranded on a remote island in the East Blue. But he's not just any ordinary child—he’s bonded to a mysterious sign-in system that grants him powers with every new location he visits.At his first sign-in, he unlocks the legendary Sun Breathing Technique, along with a boost to his vitality. From Shitmotsuki Village to Skypiea, Enies Lobby to Marineford, Ron travels the world, collecting extraordinary rewards that make him a force to be reckoned with. The Raikiri, one of the 21 Great Grade Swords, Armament Haki, Observation Haki, and more fall into his hands.As Ron steps onto the battlefield of Marineford during the legendary Summit War, the mightiest warriors—Four Emperors and Marine Admirals alike—pause, stunned by his presence. But Ron merely waves them off, “Don’t mind me. I’m just passing through.”Join Ron on his journey across the Grand Line as he signs in at iconic locations, growing stronger with every step. This is not just an adventure—it’s a legend in the making.

In the year 2139, the world changed. Fundamentally and irrevocably.

Everything happened too quickly. The sky cracked like an egg and armored dinosaur-like monsters lurched out of the fissure. The split, though small at first, quickly widened. Within a few short hours, these beasts had overrun the world.

Countries, even those who had been enemies for centuries, sounded a global alarm. Political differences were cast aside as humans scrambled to find a solution—any solution—to what became known as the Great Disaster 1.0.

Human experimentations began, first in reluctance, then in earnest. As days turned into weeks and weeks into months, failure rates remained high. Desperate for results, global authorities started turning a blind eye to how experimental subjects were sourced.

Countless victims were kidnapped and trafficked to state-run laboratories. Shi Tian was but one of them. But unlike those who died nameless, in pain, and unrecognizable, he had the fortune of surviving after being injected with humanity’s last hope—an integrated chip.

Except… the chip remained dormant. It seemed that certain circumstances must be met before the chip could be activated. What those circumstances were, even the scientists in charge could not answer.

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