After traveling through time as Uchiha Kaede, he was hunted down by Itachi on the night of the genocide. Awakening the Mangekyō Sharingan at the critical moment of life and death: The left eye images damage, causing the attacker to suffer the same damage; the right eye images Kamui, which can blur, teleport and open up a mirror world.
Itachi was wounded in Tsukuyomi and forced to retreat. Kaede hurried to save Uchiha Izumi before Obito could attack him, and used his divine power to cut off his arm. Then he activated the virtual state to break into the clan leader's mansion and sent Mikoto into the mirror space for protection. Fugaku died at Itachi's hands and Sasuke fell into a coma.
His life was saved, Uchiha Kaede was determined to keep this useful body and reborn the Uchiha clan in the future.
[It is detected that the host's mental power has exceeded the threshold, and the ambiguous strengthening system is officially activated. When the voice of the system sounded in Uchiha Kaede's mind, he fell silent, and for a moment he didn't know how to complain.
(The protagonist's ups and downs and constant collapse of character are more like Sato Kazuma's [Wonderful World] than Stick Hero)