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 28-year-old man who tragically died in a gas leak, is reborn as Claude, a child born from his mother’s secret affair. From the moment he takes his first breath, his life is one of constant danger—his father, enraged by the betrayal, attempts to kill him time and again. Yet Claude survives, growing stronger and defying the odds. On his 15th birthday, during a long-anticipated magic appraisal ceremony, a terrible truth is revealed: Claude possesses dark magic affinity, a power feared and despised by the holy order. Branded a threat, he and his mother become fugitives, hunted by the ruthless holy knights. Forced to flee, they search for the fabled Elysian Plain, a mysterious land rumored to be a sanctuary for the forsaken. For three years, they evade death at every turn, but as Claude reaches his 18th birthday, he is mortally wounded by the knights. On the verge of death, he and his mother finally reach the Elysian Plain, where destiny awaits. Suddenly, a strange system awakens in his mind: [Welcome to the Elysium of Darkness System, Lord of Nocturn.] [Increase the number of dwellers within Elysium using your seeds and blood!] [Make the cacodaemons and witches bear your children and strengthen your dark domain!]