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Infamous Second Son X A Certain Scientific Railgun

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 · 6.2K Views

The Second Embrace

**Mark** was just an ordinary, awkward teenager, deeply in love with his childhood friend, **Alice**, from afar. But his future was anything but ordinary. He survived an unimaginable eon, navigating a cosmos ravaged by **colossal empires, shadowy alien threats, and relentless galactic wars**. He witnessed humanity's desperate struggle in a **Dark Era**, pushing the limits of **advanced technology and biological potential** just to exist as mere pawns. He fought, he endured, and he touched the very edge of oblivion against a **Forbidden Legend** capable of erasing entire timelines. In his final, cataclysmic stand, empowered by the last, desperate secrets of humanity’s pioneers, Mark was granted an impossible second chance. Now, flung back to his youth, armed with a **mysterious chip** that supercharges his mind with insights from a future that almost was, Mark faces a new, beautiful reality. No longer content to simply exist, he's driven by an unshakeable desire to protect **Alice**, the girl who became his last thought before the void, and his first reason to live again. This time, he'll fight not just for survival, but for love. Witness Mark's passionate journey as he transforms, mastering advanced knowledge from a grim future to protect his precious present. Can a love rekindled across time avert a coming darkness, or will the echoes of cosmic horror find him even in this new beginning? Dive into a story of profound love, thrilling technological advancement, and a hero's unwavering promise to safeguard his future, one gentle touch at a time.
ruben_boneth · 2.7K Views

The Second Son of the Marquis Wants to Laze Around

After years of exhausting work as an editor, constantly meeting impossible deadlines and dealing with frustrating clients, he finally reached the finish line—his long-awaited vacation. No more emails, no more last-minute revisions, just pure, uninterrupted laziness. His perfect plan? Lock himself inside his house, watch his favorite shows, playing video games, sleep to his heart’s content, and embrace a life of pure relaxation. But just as he was about to enjoy the bliss of doing absolutely nothing… he woke up somewhere else. Not just anywhere—but in another world, inside the body of a young noble boy. And not just any noble boy—the second son of a Marquis, notorious for his laziness and bad reputation. Great. Just great. Yet, instead of questioning the absurdity of his situation, he did what he did best—ignored everything and went back to sleep. Unfortunately, the world refused to let him be. --- [System installed...] [Congratulations, Host! You have been chosen as the new candidate of this world.] [Please complete the following task to finish the quest and receive a reward.] [Warning: Failure to complete the quest within the time limit will result in consequences.] [...] [...] [...Host?] [Didn’t you hear what I said?] [WAKE UP!] Zzzzz… And so, his peaceful days were over before they even began. Now, with an annoying system breathing down his neck, a family that already expects nothing from him but Spoils him like idiot, a hateful Tsundere brother, and a world filled with magic power, skills, abilities, monsters, adventures, struggles and dangers, and all he wants is to laze around. But will the world really let him? The Answer is: Of course I will RP ____ if you have suggestions and ideas, join this Discord: https://discord.gg/RbcrswC3
B_N_F2 · 279.8K Views
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