From his deathbed, Hero-King Inglis, the divine knight and master of all he surveys, gazes down on the empire he built with his mighty hand. Having devoted his life to statecraft and his subjects’ well-being, his one unfulfilled wish is to live again, for himself this time: a warrior’s life he’d devoted himself to before his rise to power. His patron goddess, Alistia, hears his plea and smiles upon him, flinging his soul into the far future. Goddesses work in mysterious ways—not only is Inglis now the daughter of a minor noble family, but at her first coming-of-age ceremony at 6, she’s found ineligible to begin her knighthood! However, for a lady of Inglis’s ambition, this is less a setback and more the challenge she was (re)born to overcome. “It’s not the blood that runs through your veins that makes a knight; it’s the blood you shed on the battlefield!” The curtain rises on the legend of an extraordinary lady squire reborn to master the blade!
 
(Source: J-Novel Club)

From his deathbed, all Hero-King Inglis wishes is to live again, for himself this time: a warrior's live he'd devoted himself to before his rise to power.
 
His patron goddess, Alista, hears his plea and flings his soul into the far future. Not only is Inglis now the daughter of a minor noble family, but at her first coming-of-age ceremony at 6, she's found ineligible to begin her knighthood!
 
However, for a lady of Inglis's ambition, this is less a setback and more the challenge she was (re)born to overcome. "It's not the blood that runs through your veins that makes a knight; it's the blood you shed on the battlefield!" The curtain rises on the legend of an extraordinary lady squire reborn to master the blade!
 
(Source: J-Novel Club)

King Inglis, who lived for his country and people, strongly hopes that in his next life, "I want to further temper my skills as a knight." The wish is heard by the goddess who reincarnates the king into the far future but in the form of a cute girl! Moreover, it is declared at the age of 6 that she is incapable of being a knight despite coming from a line of knights. 
Note: Mini anime series made for the Light Novel.

After living a life devoted to serving his country and people, Inglis’ one wish to be free of a king’s burden and to train was actually heard, but as a beautiful girl! Reborn in the far future as a daughter to renowned knights, Inglis can now focus on mastering the martial arts. A wish has been granted, and Inglis will be on the front lines fulfilling the dream of becoming the strongest knight.
 
(Source: Crunchyroll)

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