GiganticBlackCat

Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school. Haruka’s beauty and charm made her the center of attention, quickly becoming the school's prima donna. But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically. Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death. However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life. Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible. This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies. From their mothers, sisters, and lovers to their closest friends, Haruto will make them his. His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.

Matthew, a 25-year-old otaku, never imagined his obsession with fantasy worlds would turn into reality—until a fatal gas leak ended his life and transported him to another world. But this wasn’t the second chance he hoped for. Born as the illegitimate son of an affair, his very existence was a stain on his family’s honor, and his father relentlessly sought to kill him. Yet Matthew, now Claude, survived, again and again, driven by an unyielding will to live. Until one day he discovered his power darkness. Feared and reviled in this world, dark mages were hunted and burned alive. Knowing his gift could become his downfall, he trained in secret under Theo, his true father. When he turned sixteen, he, his mother, Dalia, and Theo planned their escape from the small town. But their attempt was thwarted by knights and clerics from the Promised Land. Though he narrowly escaped with his life, the cost was high—his family’s safety shattered. Wounded and desperate, Matthew fled to the fabled Elysian Plains, the last hope for those like him. Just as he reached the border of the Elysian Plains at eighteen, an ambush left both him and his mother gravely injured. Collapsing on the sacred ground, he heard a voice echo in his mind: [Welcome to the Elysium of Darkness System, Lord of Calamity.] [Your first quest is available!] [Increase the number of dwellers in the Elysium using your seeds and blood! Spread your legacy by making demons and witches bear your children!]