Sword, Tiara and High Heels: The Duke's Daughter Has the Soul of a Hero (Associated Names)

The kingdom’s hero, Orthus (♂), dies in battle after failing to fulfil a promise he made to protect the kingdom for the rest of his life. When he wakes up, he finds that he has been reincarnated as Seretina, the duke’s daughter! Even though she’s a lovely, beautiful girl, she’s still the same and determined…