A Harem Life sets it covered:From the Scratch from an Intellectual

Fifteen years. That’s how long Dex Williams survived in the world’s most brutal high-security prison, a place where hope goes to die and only the ruthless prevail. He thought his story ended with a cold blade between his ribs during a prison riot. He was wrong. Dex wakes up not in hell, but in a world of sprawling magic and soaring dragons, inhabiting the body of a young noble who has just been assassinated. But this isn't just any world, it’s the setting of a fantasy novel he once read to kill time in his prison cell. Now, Dex is no longer a scarred convict; he is a noble in a powerful family. There’s just one problem: in the original story, the character he now inhabits was a minor "extra" destined to be murdered in the first arc. And so, Dex Williams begins his journey within the Falus Forest, one of the most dangerous and bloodiest places in this world. Armed only with his sharp intelligence and his prior knowledge of this world’s secrets and his experience of living inside the world's most dangerous prison for fifteen years.

I died. No epic last stand, no blaze of glory. I just died. And I woke up in the world of Demon Slayer with the worst fate imaginable: my blood is basically cocaine for demons. Every demon that catches my scent loses its mind trying to devour me. My combat skills? Zero. My system? Locked. My master? He's been trying to abandon me for months. I was screwed… COMPLETELY SCREWED! Until one night, the cutest demon girl I've ever seen across two lifetimes tackled me to the ground, straddled me, and buried her face in my neck. And instead of shitting myself in fear… my heart started racing, and something inside me finally awakened. Turns out my power activates through female contact. The closer she is, the stronger I become… Yeah, I know how that sounds. My master calls me a degenerate. Her brother wants to rip my head off. And there I am, clinging to her like my life depends on it. Because it literally does. Welcome to a story where every breath smells like flowers, every battle starts with an embrace… …and my dignity was the first thing I sacrificed to survive.

She was never meant to be there. One wrong step, one desperate decision… and she ends up on a stage where people don’t bid on art—but on people. When the final price is called, the room goes silent. Because the man who bought her… isn’t just powerful. He’s dangerous. Cold. Untouchable. Feared. And now, she belongs to him. That same night, he takes her away—not with cruelty, but with a control that’s far more terrifying. He doesn’t force her. He doesn’t need to. Because the way he looks at her… makes it impossible to run. But the deeper she falls into his world, the more she realizes—She wasn’t chosen by accident. And the man who bought her? He has no intention of ever letting her go.

Exhausting my life, burning my self, tearing my soul... I, Emiya the Hero (no mistake), am going to take on all six today! Peach Blossom Calamity MAX Nuclear Bomb Sword Immortal given for free, hand-crafting Divine Constructs peerless. mapo tofu never defeated, whether human or ghost, it's the Proctology Hospital. Emiya the Hero wants to go home, sister and wife, I want them both! (Handshake) As long as you pray for Miyu's rate-up, I will respond to the summon, tear apart Singularities, kick the Demon God King... with a not-so-smart cheat system, Emiya Ritsuka travels through worlds, starting the journey to seek miracles and find home.

Seungho Jeon was a corporate analyst who lived by numbers until a delivery truck turned him into the third prince of the Demonic Cult. While the original protagonist, Cheon Yeo-woon, receives futuristic nanomachines to become a hero, Seungho is bound to the Demonic Orthodoxy Inversion System (DOIS)—an ancient, sentient artifact that feeds on moral decay and broken bonds. To survive the cutthroat succession war, he must utilize Nanomachine Infection Parasitism to bridge the gap between his occult corruption and Yeo-woon's high-tech evolution. In a world of qi and martial honor, Seungho is a virus in human skin, treating the cult's hierarchy like a hostile takeover where the only dividend is survival. He isn't here to win the throne fairly; he's here to ensure that when the "Heavenly Demon" finally rises, he owns the soul of the god.

A survivor of the Zero Program, Gwen can control electricity, but not her heart. She has watched Leo, a boy from the slums scarred by the Battle of Los Angeles, for years from the shadows, recording his every move before finally stepping into his life. When his path drags him into the heart of the Las Vegas mafia, Gwen follows without hesitation, ready to kill and to burn the world if it means keeping him safe. As she protects him at all costs, will she know when to stop before her love turns into a lethal obsession or will everyone who dares stand between them pay the price?

"ANINDYA, I'VE LIKED YOU FOR A LONG TIME. WILL YOU BE MY GIRLFRIEND!?" That was the confession of love from a student named Julian Omega to a female student named Vanessa Anindya. "Yes, I'd be happy to accept your confession!" Anindya replied with a sweet smile. They finally officially started dating, but unfortunately, Julian didn't know Anindya's dark side. On their first date, Anindya dragged Julian by the hand to a nightclub, then led him to the VVIP room, where she proceeded to kill everyone there. That's where Anindya's true identity was revealed. Julian was shocked, but over time, he learned why she did what she did, and he continued their relationship. However, Anindya didn't know that Julian's feelings stemmed from a punishment for losing a game. When Julian told her, Anindya felt okay with it and accepted it, but the story didn't end there. Julian is determined to join the pursuit of the criminals who have brought chaos to the country, while also protecting Anindya from the criminals who have long targeted her. This is to prove that he has also fallen 100% in love with her. From here, Julian's powers and past memories resurface. After successfully eliminating the criminals, Julian asks Anindya to leave Bounty Hunter. Anindya agrees but asks Julian to inform her father, as he is the one who makes the decision. Sorry if some of the writing is still messy. Thanks for reading ^_^

She was once untouchable—the golden girl everyone admired. But one night of betrayal shattered everything, and the man she ruined? He became the Alpha CEO everyone feared. Now, years later, fate has trapped her in the ultimate nightmare: he’s her husband… and he’s married her for revenge. Cold, calculating, and impossibly powerful, he knows all her secrets—and he won’t hesitate to make her pay for every misstep. But revenge is never simple. As their fiery arguments turn into stolen glances, and punishments into forbidden desires, she realizes that the man she betrayed… may be the only one who can ever truly see her. With a past full of mistakes and a future tangled in passion, she must navigate betrayal, power, and temptation—before love consumes them both. Enemies, lovers, and everything in between—how far will she go to survive… and how far will he go to claim her?

When he was reincarnated as the Raiden Shogun and descended into the world of One Piece, everything changed! Raiden Shogun: Kaido, Wano Country is mine! Kaido: Kid, don't be so arrogant! Thunder Bagua!