From Naruto: The Path to Immortality

Chen An transmigrated into the world of Naruto—and into the Hyuga clan’s main family, no less. Good thing he wasn’t born into a branch house. But why didn’t anyone warn him? His system could only upgrade cultivation techniques, and each level required a hundred times more experience than the last. Helpless, Chen An had no choice but to grind endlessly. Until one day, he realized he had grinded his way to the very peak of the world.