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Comet 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 · 5.9K Views

Summon Leveling - The Doll Collector

In a world irrevocably altered by a cataclysmic comet strike in 2001, Earth has become a battleground. The impact tore a rift in reality, unleashing monstrous dungeons and their terrifying inhabitants, pushing humanity to the brink. In response, some individuals awakened extraordinary powers, becoming 'Hunters' – humanity's last line of defense. Enter Jason Morgan, a 25-year-old nerd whose grand dreams of wealth, fame, and a harem of adoring women are constantly undermined by his crippling procrastination. He fantasizes about being an S-rank Hunter, effortlessly clearing dungeons, all while avoiding the mundane responsibilities of his real life. His world is upended when he unexpectedly awakens as a 'Summoner. As Jason and his companions begin their perilous journey through the monster-infested dungeons, they face the escalating threat of five powerful Dungeon Kings, alien overlords who command vast armies of Undead, Beasts, Monsters, Artificial Life, and Bugs from their SSS-rank strongholds, all intent on conquering Earth. Initially driven by superficial desires and his ingrained laziness, Jason struggles to adapt to the harsh realities of a Hunter's life. This is a story about a flawed protagonist who must shed his dreams of effortless glory and embrace the arduous path of self-improvement, learning that true strength, wealth, and love are earned through unwavering effort, sacrifice, and the courage to face not just monsters, but the demons within. The fate of Earth, and the bonds he forges, depend on his ability to become the man he only ever dreamed of being. note - #character development
Let_em_Play · 2K Views

The Mercenary of Prestigious Summit Academy

[ WSA 2025 - ENTRY ] [ WARNING! MATURE CONTENT R+18 ] Synopsis: In the thousands of years of buried and recorded history, the mighty Godents—humans who arbitrarily gained extraordinary powers through a mysterious celestial body known as the Goddess—reigned supreme. After seemingly countless debates and wars of all kinds on how to maximize the utilization of the omnipotent comet that landed on Earth, the Summit Academy was thoroughly built. An academy with unique students whose words were infinitely more absolute than a mere third-world country's government... An academy where human depravity was constantly challenged and displayed against the nature of goodness... In this grand society that was founded for the sake of superficial peace and schemes in the shadows, a certain piece of information reached those in power. "The M-Rev File was lost." A mysterious document allegedly containing critical information about the Goddess... Now presumed to be at the hands of an heir of one of the Seven World Corporations... and at the same time, a royal student in the very prestigious academy. Amidst the echoes of malice, one mercenary who appeared out of nowhere and with the questionable mission of protecting this female student was admitted. Student Name: Aeon ??? Additional Information: ??? However, all things considered, on Aeon's first day in this school that could decide a person's future in the blink of an eye, he received a peculiar text message— / I miss you... / * A/N: This R+18 story isn't something just to satisfy the reader's lustful nature...
NuminousOne · 45.4K Views
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