Naruto: The Great Swordsman of Konoha

The plot? What does that have to do with me? From the moment I was born, the original storyline ceased to matter. The only thing that counts is the sharpness of the blade in my hand. Come, then—take a single strike from Konoha's greatest swordsman! Uchiha Madara: "Shirakumo Ryosuke, I acknowledge you. Among all the opponents I have crossed blades with, no one surpasses your swordsmanship. I, Madara, declare you the strongest!"—A modern man reborn as a native of this world, carrying his memories, with no system to aid him.