Kazuki reincarnated into the Naruto universe as the son of Uchiha Kagami and father of the legendary Uchiha Shisui. Caught between the Hokage faction's suspicion and internal clan politics, he faces the same deadly path that claimed Shisui—unless he changes everything. Armed with a combat simulation space, Kazuki awakens Indra Chakra from the start. Through relentless simulation and decisive victories, he acquires the Sage Body of the Uzumaki and Senju clans, Asura Chakra, the Rinnegan, and the Ten Tails—each enemy defeated brings unprecedented power. Internal clan conflict becomes irrelevant. The Uchiha follow his will. When Konoha's leadership moves against the clan, Kazuki reminds them of a forgotten truth: the Uchiha founded Konoha itself. Susanoo's shadow falls across any who challenge him. When the Otsutsuki arrive seeking dominion, Kazuki crushes them effortlessly, their strength barely exceeding the Sage of Six Paths. As he watches their defeat, a single thought crosses his mind—they were never worthy opponents to begin with.