[Crossover] Can a Sorcerer Become a Magician?

A red tattoo suddenly appeared on the right hand of Tokito Shinichi, the only second-year student at Jujutsu High. Before he could react, his uncle arrived from far away, bundled Shinichi up in a hurry, and casually arranged for him to take a long leave of absence. During this period, which was called a vacation but was actually a hellish ordeal, Tokito Shinichi experienced, among other things: 1. Starting a career as a mage from scratch 2. Is there something wrong with my first face-to-face meeting with the ancestor? 3. Were the sorcerers from a thousand years ago all completely insane? 4. Always being delighted by this laughing Mr. Gold Weathered by hardship, the only third-year student, and the winner of the Holy Grail War, Tokito Shinichi finally crawled back to school, only to be shocked to discover that Tokyo had turned upside down! What? I’m fighting Sukuna? Go tell that to my Fifth Magic, invincible Mr. Gold, and the ancestor’s breathing technique... Tips: 1. The timeline is chaotic. 2. Backgrounds for minor characters are made up. 3. Everything serves the plot; I’ll try to avoid unreasonable details. 4. Some things may differ from the Nasuverse because there are parts I don’t understand. Theme: The future shapes the past, and the past sustains the present.