Izuna, whose eyes were gouged out by her brother and was supposed to die, was unexpectedly resurrected in Konoha under the rule of the third generation. She unexpectedly regained her eyes, but could not remember her past or her name. She recognized Sasuke as her brother and joined the Kakashi class with Naruto, Sakura and others.
During the trial trip to the Forest of Death, in order to protect important things, Izuna took the initiative to bear the curse seal for Sasuke and became Orochimaru's experimental subject. During his temporary stay in Konoha, not only did his moral integrity disappear, but even his domineering personality in his previous life was contaminated by the bad habits of a bad teacher in Konoha!
See how Izuna reaches the top and revives the declining prestige of Uchiha!