Naruto: The Legend of Uchiha Kyuizumi

(No System + genius + a little historical nitpicking + changing the original tragedies + an unpredictable plot)

The female lead transmigrates to Konoha and becomes Uchiha Juyuquan. Born in Year 10 of Konoha, she loses both parents and is placed under the care of Kagami Uchiha. The Sannin are her contemporaries, and White Fang is her teammate.

As a child, Juyuquan is driven to improve by anxiety about the war that will erupt in the future, earning herself a reputation as a young prodigy. She studies Medical Ninjutsu, researches forbidden techniques, and trains in swordsmanship. Her curiosity and perseverance far surpass those of ordinary people.

After the death of First Hokage Hashirama Senju, Uchiha Juyuquan decides to graduate early. At just seven years old, she steps onto the battlefield, where she fights for three years and earns a name for herself. But that name and her bloodline also draw the attention of enemy villages, and under special circumstances, she is captured. She isn't rescued until two years later.

Yet during those two years in captivity, through her own efforts, she manages to change the outcome of Tobirama Senju's death at the hands of the Gold and Silver Brothers. The price is steep, but the gains are considerable.

The war ends in victory, and peace follows. Juyuquan's guardian, Kagami Uchiha, also finds a spouse, and everything seems to be moving in a good direction.

But can things really keep going well? Everything happens for a reason, and preventing the deaths of certain important figures sets the story on a bewildering new course. The advantages she once had no longer seem to be advantages.

Faced with the dangers ahead, Juyuquan chooses to tear the heavens apart.