Reborn to Master the Blade: From Hero-King to Extraordinary Squire anime unveiled the non-credit opening video after the first episode aired on Monday. AUO and MORISAKI WIN are performing the opening theme song “DAY1.” STUDIO COMET is animating the adaptation.
The anime is being produced based on Hayaken’s light novel, which was first published on the Shosetsuka ni Naro web novel service in March 2019. Hobby Japan has been publishing the light novel series with art by Nagu under its novel label HJ Bunko since November 2019. The light novel released the 8th volume in August 2022. Moto Kuromura is drawing the manga adaptation and the 4th volume was published in November 2022.
J-Novel Club licensed the light novel for English and describes the plot as:
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: Official YouTube
© Hayaken, Hobby Japan / “Master the Blade: From Hero-King to Extraordinary Squire” Production Committee