Naruto: My Skills Max Out Instantly

Transmigrated into Naruto as Nara Cross Country, a supposedly 'branch' clan member bound by a Hokage-imposed curse seal, my future looks bleak. With Kakashi and Itachi already rising, and the Kyuubi attack looming, my four-year-old body and pitiful chakra reserves promise nothing but cannon fodder. Then, my 'Acceleration Upgrade APP' awakened. Instant mastery. My Shadow Mimicry, perfected overnight. Tree climbing and water treading, flawless in minutes. Every mistake I make is instantly corrected, pushing my chakra control and efficiency to god-tier levels, shocking even seasoned Jonins. But this terrifying power comes with a price. Can a boy destined for control truly wield unstoppable shadow arts to shatter the chains of fate and forge his own legend, or will the system's true purpose be revealed when he least expects it?