anime adaptation of the light novel Reborn to Master the Blade: From Hero-King to Extraordinary Squire (Eiyū-Ō, Bu o Kiwameru Tame Tensei-Su: Soshite, Sekai Saikyō no Minarai Kishi).
Check out the teaser:
Synopsis:
King Inglis's last wish is to live as a warrior again. However, when he awakens, he realizes he has been reborn as a girl into a noble family! Even though she is rejected from knighthood, she sets out to be the most extraordinary squire who ever lived.
Finally, the author's novel was released by Hayaken Shōsetsu ni Narō website in March 2019.