The Demon Lord's Daughter and the Tower of Seals

As the daughter of the Demon Lord, Lilina lived without a care in the world until the fateful day her father was defeated by the Hero. Now having lost her demonic powers, she's stuck living miserably in a human town where everyone hates her for who she is. To improve her reputation and her quality of life, Lilina accepts requests to slay monsters from the Hero and gradually grows accustomed to combat. All the while, on the advice of Diego, the Demon Lord's former right-hand man, she works in secret to obtain the talismans that will grant her access to the Tower of Seals and allow her to regai(Storyline via IGDB)