sin system: demonic harem after reincarnation

James, a college student struggling to escape his poor and weak life, takes on a delivery job to cover his remaining tuition fees and personal expenses. His relationship with Selena is the only source of happiness in his otherwise bleak existence until it is extinguished by her betrayal. She cheats on him with Randy, the arrogant and affluent star quarterback. Devastated and consumed by anger, James decides to confront Randy but is struck on the head, resulting in a concussion. This concussion triggers a mysterious system called "Opportunity System" that grants him one million dollars. The catch? He has only three days to spend it all. Will he manage to spend the entire sum in time? What will happen when James eventually discovers that the mysterious system was not what it seemed, but rather a scheme devised by RJ Black?

He was forced to marry a pregnant woman, and it was because of that marriage that he became a rich man.

His wife approached and married him because her family thought he was part of the city’s most famous and wealthy family but when his wife and her family found out that Andrew was a bastard child, they mocked and looked down on him. Due to him being poor, everything he knew and loved disappeared. Beaten to death, Andrew was left with no breath until he was struck by a mysterious force of lightning granting him a system. [Congratulations Andrew Raine. You have been selected as a host for the TRILLIONAIRE SYSTEM] A ding and a notification bar was all Andrew needed to change his life. With the force of the power granted by this system, He would trample on everyone who has ever mocked him, rising to the top with great speed.

Allen lost his job after being wrongly accused and his sister was being adopted by a loan shark who he had loaned money from and wasn't able to pay back. He is left to go beg the people who had abandoned him but got humiliated. His mother died too, taking away the hope he had. He felt lost and wanted the world to end. He was given a sunglass by an old woman which he hesitantly collected. Wearing the sunglasses, he discovered it was an advanced system that would bring riches to him. Now, he would get back to everyone who made his life miserable. But, there was a limit to the sunglass power of which he wasn't aware.

After dying in a fission blast that decimated an entire state, Maxmillan's soul transmigrated into the body of a five-year old in a new world where Astra Mystralis — an energy that causes endless magical manifestations, could be harnessed and manipulated to invoke countless amazing magical effects. But unfortunately for Maxmillan, he couldn't sense or perceive Astra Mystralis, talk more of control or manipulate it and was therefore labeled a 'Reject' which prevented him from interacting with anyone in the society, since they avoided him like a deadly contagious plague that killed immediately it was contracted. So, with such a label accompanying Maxmillan everywhere, how would he survive? How would he fare against the oppressive, abusive and wicked intimidatory acts done to him by the proud and lofty casters of Astra Mystralis? Would he be able to thrive and function in a world where everyone, including five to six-year olds could control Astral Mystralis and bring about myriad fascinating magical effects? To know more, follow Maxmillan in his unfathomably-arduous journey as he tries to survive, thrive and defeat every nigh-insurmountable odd that would appear in his path using the Supreme Battle-Technology System; a dimension-warping, living technological consciousness that possesses near-infinite, super-advanced technologies and would rewardingly empower him with futuristic items like: Multiple-Barrel Laser Burst Emission Gun, Strength-Amplifying Exo-Mechanical Arms, Wide-Area Plasmic and Electric Arc Grenades, Outer-Space Fast-Flight Heavy Armor, Turbo-Thruster Propelled Super-Speed Ultracycle and many others, for as long as he can complete suddenly prompted tasks, quests and missions before their stipulated deadlines. So, with unending technological empowerments, biological augmentations, and advanced cybernetical fortifications obtained from the Supreme Battle-Technology System, watch how a war-seasoned Maxmillan will fight his way through teeming large numbers of Astra Mystralis users and gradually ascend to a great height of fame, honor and glory!

Victor Dyllon's life was cut short when he saved a little girl from being hit by a van, only to be hit himself. Extradimensional creatures from The Land Between take pity on him and bring him to life once again in a brand new world. Armed with a powerful system that unlocks more of his arcane abilities after every fight, Victor may be the last thing standing between the multiverse and destruction at the claws of a dark and powerful threat. His journey is only just beginning, and his magical sci-fi system is getting stronger all the time!

"Please provide the third unit with these apples for consumption." "Apples?" "These are enchanted golden apples; it will make them invisible for an hour. It is going to help with the mission. Oh, I almost forgot the luminous carrots that will enhance their night vision as well." Circus, an abandoned teenager, had no idea that he would one day dominate and save the world through farming, which he began for survival purposes. "I started by growing simple, ordinary vegetables. Hmm! The journey has been long and arduous."

Nathan Hunt, a young man burdened by his father's debt and trapped in a loveless marriage to the daughter of his tormentors, finds his life turned upside down when a pair of inherited dice unlock a powerful family secret - The Fortune System (FORST). This sentient system promises wealth and freedom, but at a cost: weekly challenges with unpredictable rewards and punishments. Driven by the promise of vengeance and a desperate need to reclaim his life and rescue his sister who's also a slave with his in-laws, Nathan embraces the FORST's gamble. Each roll of the dice unlocks not just wealth, but the perfect means for retribution and revenge. It's time to take revenge, time to take over their world, time to make them pay.

Burdened by poverty, Keagan Thompson's life takes an unexpected turn when he discovers the Veilwalker System, a hidden realm of power and opportunity. Chosen as its host, he gains unimaginable riches. With newfound wealth, Keagan embarks on a quest to become the number one hero. But the path to greatness is riddled with challenges. He faces formidable opponents, navigates treacherous alliances, and confronts his inner demons. As Keagan delves deeper into the world of heroes, he realizes the System's generosity has a price. Fame, wealth, and morality intertwine, forcing him to make difficult choices that test his integrity. Joined by diverse allies, Keagan's journey transcends physical strength. He hones his skills, forges unbreakable bonds, and discovers the true meaning of heroism. Thrilling battles, sacrifices, and unexpected twists abound as Keagan strives to claim the title of the number one hero. Can he navigate temptations and stay true to his values? Prepare for a captivating journey where dreams collide with reality and the definition of heroism is tested. Will Keagan rise above the challenges and fulfill his destiny?

The story follows Kaede, a player in a fantasy online game, as she becomes incredibly powerful and starts to break the game with her skills. Along the way, she makes friends with other players such as Yuki, Clover, and Miyuki, and they form a guild together. However, they also face challenges and rivalries, including a confrontation with a dark guild known as the Raven Thorn. Through it all, Kaede learns the importance of choosing her friends wisely and the value of being true to oneself. Despite facing challenges and nerfs to her abilities, she remains determined to continue her adventures in the game world.