Skill-Eater: Prison World Saga - Chapter 4: Crack

Leon is an average high school student who likes to watch anime and read novels.
He's about to cross the street, only to be greeted by a truck and died.
But, he got reincarnated as Uchiha yet dead again because Itachi killed him.
Leon got reincarnated again as the grandson of the recovery girl.
He got kidnaped and tortured by All For One.
After his third death, he got reincarnated as a son of Bibi Dong.
In this fourth life, he wants to change his fate to become the strongest.

Note: Please read the tag before reading.
- English is not my first language, so there would be grammatical mistakes in this story.
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He is the master of six kingdoms. As long as he wanted, his cavalry is ready to wipe off any country.

Konominato Aoi, who had been learning Kendo at her family’s dojo since childhood, had a dream of becoming the best in Japan in Kendo, as her father wished. However, that dream didn’t come true. Disheartened by the failure of her student dreams, Aoi became a high school teacher with a new dream: to make her own students the best in Japan in Kendo.Facing numerous challenges and feeling pessimistic, Aoi lost consciousness on the spot and found herself transported to a different world. The one who helped the now-younger Aoi was Owen Millers, an elven mage. Out of curiosity, Owen decided to impart his magical knowledge and research results to Aoi. Inheriting Owen’s skills and knowledge, Aoi became a mage and, under Owen’s guidance, became a teacher at the world-renowned magical academy.However, the academy was filled with the entanglements of aristocratic society, discrimination based on magical power, and individuals exploiting noble students. Aoi found herself dealing with various situations as she navigated through these challenges. This is the story of Aoi Konominato, a female teacher later known as the strongest archmage and the witch of the academy.