Swordsman System In Naruto

Yukan Norio, a boy living in Konoha with the soul of an earth resident. He was an unplanned element who interfered with the course of the original story. But, what if he also created some unexpected things? What if there are unexpected twists? ---------------------- The Mc's behavior in the first few chapters is like that of an idiot. It is because someone living in our world would not be experienced in fighting and killing.