Ke Zhen'e, a blind old man in his seventies, took an iron staff and his whole life's inner strength and physically traveled through the troubled times of the Warring States Period in Naruto.
Chakra is rampant in this world, and ninjutsu is like magic, but he cannot see, cannot speak, and is helpless. However, no one expected that this old body from another world would have the same internal energy meridians as the chakra meridians - he could open his meridians in one day, perfect his technique in three days, and become famous in the Warring States Period in one year.
Fire escape? He could tell his position by listening to the wind and get half a step ahead. Illusion? Blind, immune to all means. Sharingan? Samsara Eye? In his ears it was just the murmur of chakra flowing. When the golden "chivalry" is born from the blend of inner strength and chakra, this iron staff becomes a weapon that even Uchiha Madara must face up to.
He refused Senju Hashirama's position as Hokage, saying only: "I am not an official, only a gatekeeper."
From then on, there was a Jishi Hall in Konoha Village. There was a blind old man in the hall who taught people how to read, set bones, and recognize medicine. He also taught three children who later became famous in the ninja world - Tsunade took the iron staff from his hand and turned it into a monster and a hundred heroes;
He had seen too much blood and fire in Konoha.
On the night of the Kyuubi, he held Minato Namikaze's body and shattered the earth with his iron staff; on the night of the genocide, after hearing Uchiha Itachi's plan, his iron staff cracked but did not stop him, only saying "I don't blame you, but I don't forgive you"; before Pain attacked the village, he went to Amegakure alone, and used his century-old chivalry to defeat the heretic demon.
