SpiderGwen: I have a system?! - Chapter 177: Serum Hunting

Sein was only a child when he was abducted from the surface world and forced to join the Black Magic Academy. In the Underworld, strength reigns supreme and the weak struggles to survive. As the death toll of magic initiates continues to rise within the walls of the academy, Sein’s quest for knowledge and power is a constant battle for survival.

Memories of his parents and the starry night sky in the surface world are fading with each passing day in the Underworld.

“Is Magus World the name of the world we live in? Where is my home in the Magus World?” These are the burning questions that Sein has in mind.

Will he be able to rise to the pinnacle of power, discover the truth of the world and ultimately find his way back home?

Official blurb:

He hails from the banished land of the Underworld, bound by a single unforgiving rule—survival of the fittest. He is the seeker of truth, a mage who treads the fine line between sanity and madness. In a world where myths have crumbled and chaos holds sway, it is strength that reigns supreme.

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This world is Heaven.

Because this world has everything you dream of, everything you wish for.

This world is Hell.

Because everyone in this world are parts of a never-ending massacre.

Are you fighting to survive, or fighting to come home?

- Description from Novelupdates

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.

When Simon dies, it turns out there's more to combat than lightning reflexes with his controller, and the path to becoming a hero is more brutal than he can imagine as he descends into The Pit. Death after Death is a dark, time loop/Isesaki story with roguelike elements, that explores some of the common tropes in a different light.