Jujutsu Kaisen: I Reincarnated as the Zenin's Bastard [Naoya Zenin]

Three lives. Three worlds. One deeply inconvenient soul. He was a doctor in his first life — underpaid, overworked, and quietly building a craft that no medical textbook would ever acknowledge. In his second, he carved out a comfortable niche in the Marvel universe, selling longevity to billionaires and collecting weapons the way other people collect regrets. By the time his third life arrived, he had developed a certain resigned expertise at waking up somewhere terrible. This time? He opens his eyes inside Naoya Zenin — the Jujutsu Kaisen world's most irredeemable minor antagonist. A character so defined by arrogance, misogyny, and a comically inflated sense of his own importance that even his death inspired more relief than grief. He is seven years old. He is in a feudal sorcerer clan that hasn't updated its worldview since the Edo period. And he is, by the world's own logic, entirely disposable. The original Naoya was destined to die twice: once as a man, once as a curse. He has other plans. Armed with three lifetimes of experience, a blood magic system no one in this world has ever seen before, and an absolute refusal to become a martyr for a clan that doesn't deserve one — he sets out to do what he does best. Adapt. Invest. Manipulate, just a little. Build something out of nothing, and refuse to die on anyone's schedule but his own. He won't pretend to be a hero. He has no interest in saving the world. What he wants is simpler, more honest, and considerably harder than it sounds: to live, on his own terms, in a world that was specifically designed to kill people like him. The clan thinks he's a prodigy. The Jujutsu Council thinks he's an anomaly. Toji Zenin thinks he's an insufferable eleven-year-old with a business degree and too much confidence. Satoru Gojo, at twelve years old, has just discovered that something in this boy's face doesn't make sense — and for the first time in his short, effortlessly superior life, he has no explanation for what he's looking at. Nobody mourns Naoya Zenin. That's fine. He never asked anyone to. **Tags:** *Transmigration · Antihero MC · Blood Magic · Jujutsu Kaisen · Smart Protagonist · No System · Slow Build · Canon Divergence · Dark Themes · Morally Grey · Found Meaning · No Harem · Business & Strategy · Psychological*