The Old Philosopher of the Ninja World

Synopsis: Philosopher Uchiha Tetsuya transmigrated to the Warring States period of Naruto, competing with Uchiha Madara and Senju Hashirama, who are of the same age, but doesn't even have a system! Uchiha Tetsuya: “Let me think, what advantages do I have?” “That’s right, my strength is cultivated little by little on my own!” “Let me think again, what disadvantages do I have?” “My strength is cultivated little by little on my own ╮(╯▽╰)╭” “Oh, right!” “I also have a thinking brain of a philosopher.