Starting from Today, I’m a Princess?

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A warrior with the mission of defeating the Demon King even if it meant sacrificing her own life. Although it seemed like the rest of her life would be full of a glittering bright path… In reality, it’s the gutter! In order to re-find an ordinary life, after having been thoroughly exhausted, she makes a wish.
“Please turn back time.”
But where’s the ordinary life…?
“I’m definite that this child is the Princess that was lost 12 years ago.”
From a penniless warrior who didn’t even have a name
she became Nanael, a princess who has it all!

or:

https://treemanga.com/manga/starting-from-today-im-a-princess/