My Ultimate Sign-in System Made Me Invincible

After being transmigrated to another world, he finds himself reborn as a young boy, raised and subtly manipulated by a wealthy woman. Disillusioned by his circumstances, he quickly loses all motivation. Blending harem and anime crossover elements. It features worlds inspired by series such as School Days, Saekano, Highschool of the Dead, Food Wars!, My Youth Romantic Comedy Is Wrong, As I Expected, Eromanga Sensei/Oreimo, and Is It Wrong to Try to Pick Up Girls in a Dungeon?

Hades, the king of the underworld, rules over all life in the universe. Despairing of humanity's folly, and to prevent further depravity, he punishes all rulers of life in the universe by condemning those who commit evil in life to the deepest hell after death, serving as a warning to humanity. Those with pure souls are chosen to enter the Pure Land of Bliss. And I, the new Hades, inherited his power, possessing the infinite deductive ability to manifest all powers, allowing me to observe and explore other worlds within my original world. [Multiple Women] + [Invincible] PS: The protagonist's first volume is a behind-the-scenes story.

Fred transmigrated into the SEED universe, becoming Flay's older brother. Facing the threat of his entire family being wiped out, fortunately he possessed a simple yet extraordinary system. Studying increases knowledge, training enhances strength. Thus, the answer is clear - I will strive! To survive until retirement!!! Kira: My brother is an incredibly good person, if only he would approve of my relationship with Flay. Athrun: A natural human stronger than me? Does such a thing truly exist? Lacus: Fred is wonderful, it would be even better if he didn't constantly think about retiring.

After being reborn into the Gundam SEED world, Felix spent fifteen peaceful years in Copernicus City, only to suddenly relocate to Junius Seven. The mere thought of Junius Seven's destined future made his scalp crawl. Realizing that changing locations might prove futile, Felix resolutely decided to join ZAFT, determined to alter the fate of Junius Seven and save his parents. Once stepping into the whirlpool of war, Felix understood there was no turning back. To achieve the future he desired, he could only advance relentlessly and make continuous choices. ... "The world is but a grand makeshift stage, where everyone is both actor and playwright; the script changes constantly, the performance shifts endlessly, and the future resets perpetually. Only the director who calls 'cut' holds the power to decide the future!"

Yang Hui mysteriously finds himself transported to the world of Mobile Suit Gundam 00, but as a child. He becomes a member of the Xiong family and embarks on a journey with a flawed, monkey-like system. Determined to change all the tragic events that haunt him, Yang Hui believes he’s set everything right, only to discover that the real challenges are only just beginning. (PS: The story is an infinite flow, with appearances from characters and mechs from side stories, though the main plot follows the core storyline. The early chapters focus on Gundam OO, while later arcs introduce super robots and fantasy mechs.)

Stolen at birth and crushed beneath her step-family's cruelty, Raven awakens on her seventeenth birthday to memories spanning ninety-nine lifetimes—and this time, she plans to change everything. Once called Mara Brenner, a forgotten girl hidden in a servant's robes, she now remembers every betrayal, every death, every moment of suffering across nearly a century of lives. In each existence, she endured enslavement, loss, and the tragic death of her child. But death was never her ending—it was her education. Blessed with a rare tri-bloodline combining Dragon strength, Lín healing, and Zhào wisdom, Raven carries within her soul-space ten mystical Blood Essence Beads. Each bead holds the power to awaken a fragment of her divine body, rebuilding her from bone to spirit while granting mastery over lost technomagic arts: alchemy, artifact forging, runes, and the fusion of magic with cutting-edge science. Yet each awakening will test her mind, heart, and will to their very limits. Around her looms an empire ruled by the ruthless Eight Great Families, where noble bloodlines battle for supremacy in a brutal 100-Year Tournament. Hidden beneath them lurk the secret cultivation clans—ancient powers manipulating bloodlines and history itself. Her stepsister, Amara, pampered and poisonous, conspires to steal both her name and destiny, guided by a devourer seed that whispers corruption into willing ears. What Raven doesn't yet know will shake the foundations of reality: she is a Pillar Soul—one of the fundamental anchors holding Ascara's existence together. If she falls to darkness, the entire plane collapses into the void. To protect her world, she must locate and awaken the other Pillar Souls scattered across the world: a dying child, a broken soldier, a fallen saint, a betrayed lover, and others—each a fragment of Ascara's strength, each teetering on the edge of corruption. Time is running short. The Great Shift approaches in five years—when spiritual energy will surge back into a world that has forgotten magic. As technology begins to fail and ancient powers stir, Raven must navigate step-family betrayal, aristocratic oppression, and imperial conspiracies while a darker truth emerges: the Devourers, cosmic parasites born from primordial hunger, seek to twist her suffering into corruption and drag Ascara into eternal darkness. Standing between her and salvation are false allies and tragic enemies like Kael Xuán—heir to the ruling family and her betrayer across multiple lifetimes—while the shadowy SIS organization sacrifices innocents in the name of maintaining "order." Only one figure recognizes her true nature: the exiled Keeper of the Accord, an immortal guardian bound by cosmic law to protect Ascara's souls. In him, Raven may find not only a reluctant ally but an echo of her grandparents' forbidden love—proof that loyalty and sacrifice can triumph against the tide of ambition and despair. In a fractured empire where ancient cultivation lies broken, magic is dismissed as myth, and technology serves as the ultimate weapon, one forgotten girl will rise to reshape the fate of worlds. But first, she must survive becoming the most dangerous thing in existence: herself. ◊ ◊ ◊ Not suitable for readers under 18 or those sensitive to intense emotional/violent content. Reader discretion is strongly advised. Join me on Discord: https://discord.gg/mvwer8QhHz

In the East Blue, after two and a half years of isekai life, he’s only managed to become a lieutenant, yet he’s no match for a pirate with a million-berry bounty. Just as Ivan, with his outstanding looks, catches the eye of the female pirate Alvida, he suddenly obtains the Multiverse Template System! Gojo Satoru Template: Cursed Technique Lapse: Blue, Cursed Technique Reversal: Red, Black Flash! Kaido, how is Black Flash not Conqueror’s Haki Infusion? Uchiha Madara Template: Almighty Push, Universal Pull, Planetary Devastation, Tengai Shinsei! Fujitora Issho, you think you’re the only one who can pull down meteors? Kurosaki Ichigo Template: Getsuga Tenshō, Earth-Shattering Crushing Strike, Black Flow Fang Thrust! Hawk-Eyes, you still need more training—I am the true Swordsman Master! Until finally, countless templates converge into one, and Ivan stands above the Holy Land of Mary Geoise. Below, the Gorosei turn pale with fright, blustering, "Ivan, what are you doing? Don’t forget your identity, you are the..."

Li Feng was just a regular pervy guy from Earth who somehow landed in a world where cultivators cared way more about the Dao than their own mortal bodies. On his first day, by some crazy luck, he found 35,000 spirit stones on a dead cultivator. He blew 30,000 of those stones just to buy his way into one of the top sects as an outer disciple. After years of grinding and nearly burning through the rest of his stones trying to break through, he’s still stuck at the lowest cultivation level. Now, with only a hundred stones left and his patience running thin, he decides to spend those last stones on a night of mortal pleasure with a cold, distant senior sister who usually doesn’t give a damn about things like that. She agrees ,not because she’s interested, but because the price is hard to say no to. What Li Feng doesn’t realize is that this reckless move give him the chance to finally break free from his bottleneck and change everything. ___ A lot of Smut and Plot, No NTR, No Yuri. https://discord.gg/z97rRPN3Wt

Starting with Hoshimi Miyabi is fine, after all, she has superhuman strength and a powerful sword, so paying a price is only natural. But why is there another Hoshimi Miyabi?! And why am I facing the Anti-Air Section 6 right from the start?! How am I supposed to play this? This is the story of someone thrown into a chaotic situation where powerful abilities, unexpected encounters, and strange circumstances turn life into something far more complicated than expected. With transformation, semi invincible abilities, slice of life moments, and a story driven journey, surviving this world might be harder than it first seemed.

Bad news: I transmigrated into the brutal universe of Warhammer 40K… and Chaos started hunting me from day one. Good news: I awakened a god tier salvation system capable of saving those destined to fall into despair. The cost? Turn the twenty one legendary Primarchs into my loyal sisters. [Ding! Perfect Swordsman Fulgrim has been successfully redeemed!] She transformed into a platinum-haired beauty whose single sword strike could split the stars. [Ding! Saint Sanguinius, the Holy Blooded One, has been successfully redeemed!] Now a radiant six winged seraph, she refuses to leave my side. To the Human Empire, I am the greatest heretic in history. Three thousand Inquisition warships have been dispatched to hunt me down and purge my existence. To the Chaos Gods, I am the Fifth Calamity. Billions of daemons have been sent to corrupt my growing sisterhood. But what no one knows… The clingy, delicate blonde girl always following me around? She’s actually the Emperor of Mankind. And while Guilliman continues his endless crusade across the stars, he has no idea that a brand new legion, composed entirely of legendary Primarch Sisters is already marching toward Terra.