[Crossover] How to Make a Name for Yourself in the Jujutsu World Using a Secret Identity

She woke up to find the world turned upside down. A wildly imaginative boy crossed paths with a System. He stared with dead fish eyes at the bold, black, floating words that were silently impossible to ignore: "Make yourself known in the Jujutsu world." The boy: Give it up. That's never happening. And then... They say the Cursed Spirit Manipulator saved a child. The child knew nothing about the ways of the world, yet was absurdly powerful, practically a walking human weapon. Every so often, he would look confused, take the Cursed Spirit Manipulator's hand, and ask: "Big brother, why can't I kill people?" A certain Cursed Spirit Manipulator: #HowToRaiseAKid##HowDoIGiveThisGuyTheRightValues# They say there's a mysterious person in the black market, always looking lazy and sleepy, who keeps snatching people and gear without a word, leaving both sorcerers and curse users up in arms. The languid young man stubbed out his cigarette, a teasing smile barely curling his lips. "Can't help it. Everyone says I have a nasty personality~" They say a certain white-haired high schooler got harassed during a mission. Not only was the mission snatched from under him, but he was also treated as a substitute for someone else. And the culprit turned out to be a visitor from another world? The black-haired, black-eyed boy in combat gear kicked an unidentified object aside and called excitedly to the white-haired high schooler: "You look so~ much like my childhood friend! Are we related by blood or something?" The white-haired Six Eyes user: ??? Having turned the jujutsu world into a complete mess, the boy still thought of himself as young, pitiful, and helpless. "I feel like my mission is so hard..." System: ...Wake up. Secret identity story. Not sure whether the identities will be exposed. A tangled web of grudges and rivalries, and even the secret identities are connected in ways that can't be undone (I made that up). Coming soon, in the queue. Theme: The world needs surprises.