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Rim Runner Science

A Certain Undefined Gaia

Gaia City stands as the pinnacle of human advancement—a sprawling, walled metropolis where science has given birth to the extraordinary. Within its boundaries live Gaias, individuals born with Arthem circuits, synthetic pathways infused with Psi Waves and the mysterious energy known as Metra. Ranked from Eta to Alpha, Gaias are classified, studied, and controlled under a rigid system designed to maintain order and suppress the unknown. But science can only explain so much. Beyond the city's borders dwell the Mergus, wielders of pure Metra through forbidden Ancient Scripts and sacred texts long dismissed as myth by Gaia City's researchers. Unlike Gaias, Mergus tap into forces unquantifiable, echoing lost wisdom and primal power. Contact between the two worlds is outlawed—for good reason. Exposure to raw Metra could cripple or kill a Gaia, disrupting their Arthem at the core. Ryouma Winslow, an Eta-class Gaia dismissed as a nobody, had no intention of getting involved with either side. But everything changes when he crosses paths with Archive (Shiro), a strange girl with fractured memories and a presence that doesn’t belong in Gaia City. Helping her seemed simple—until restoring her mind reveals a truth that shatters the world he thought he knew. Now entangled with rogue Mergus factions, hunted by unseen forces, and navigating fragile alliances with powerful Level Alpha Gaias like the electrifying Mei Tokisaki, Ryouma finds himself drawn into a multilayered conflict that transcends science, challenges belief, and threatens the foundations of Gaia City itself. Because in a world split between science and sorcery, the greatest danger is a boy who doesn’t fit into either side. Author's Note to Readers: This story draws clear inspiration from the Toaru series (A Certain Magical Index / Scientific Railgun), and longtime fans will notice structural and tonal similarities in its arcs, setting, and faction dynamics. While some adaptations and elements may feel familiar, please know that the world, characters, power systems, and underlying themes in A Certain Undefined Gaia are entirely original and unique to this work. Think of it in the same way that fans appreciate both Mushoku Tensei and TBATE—similarities exist, but each story carries its own voice, meaning, and direction.
Its_MJayStarr · 6K Views

First Impact: From The Rim

*Cover art not mine* Raiden has spent his entire life trapped in Cicada's South Rim, running packages for the Squadron gang just to survive in the city's most dangerous district. With nothing but a faded childhood hoodie and an unbreakable desire for freedom, he's resigned himself to a life of poverty and violence—until the day the sky tears open. When a comet of unknown origin collides with Earth in an event known as the First Impact, the world stops. Time freezes. Reality bends. And when it resumes, seventy percent of humanity awakens with supernatural abilities tied to the strength of their deepest desires. But Raiden is different. His yearning for freedom—the most powerful desire on the planet—marks him as one of the Crowned, an elite few whose abilities transcend normal limits. Armed with devastating light manipulation powers that make him nearly godlike, he finally has the strength to break free from the chains that have bound him his entire life. As the world descends into chaos and new power structures emerge from the ashes of the old, Raiden must navigate a landscape where strength determines survival and the weak are crushed underfoot. The same freedom he's craved may come at a cost he never imagined—because in a world where desire shapes reality, getting everything you want might destroy everything you once were. Some prisons are built from poverty and circumstance. Others are built from power itself. And sometimes, the greatest trap is finally getting what you've always wanted.
Leviiathn · 1.5K Views

The Apex Protocol (TAP)

In a world scarred by the 'Great Sundering' and plagued by the insidious Void Blight, Kael lives a brutal existence, fiercely protecting his small settlement, Haven. When the ruthless warlord Ragnar attacks, abducting Kael's sister, Elara, Kael is pushed to the brink. In a desperate, agonizing transformation, he awakens the 'Apex Protocol,' a primal system that unleashes monstrous power, turning him into a terrifying force of nature. Haunted by Elara's scream and battling the Protocol's feral whispers, Kael embarks on a relentless quest through the desolate Dustlands. He navigates treacherous landscapes, confronts mutated horrors, and clashes with Ragnar's relentless raiders, all while struggling to retain his humanity. Along the way, he forms a tense alliance with the Ash Runners, a band of rebels fighting Ragnar's tyranny. Their journey leads them to the Iron Citadel, Ragnar's formidable stronghold, where Kael discovers Ragnar's horrifying connection to the Void Blight – a sentient, malevolent entity. As Kael confronts Ragnar in a cataclysmic battle, he uncovers the Apex Protocol's true purpose: an ancient countermeasure against the Blight. Faced with the ultimate choice, Kael must fully embrace the monstrous power within to sever the Blight's core, risking his very soul to save his sister and the dying world. The novel culminates in a brutal victory, leaving Kael as the 'Silent Guardian,' forever walking the line between man and beast, a beacon of hope in a world slowly healing.
Jeel_Kathiriya_0292 · 5.9K Views
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