Noroware Seijo, Boukun Koutei no Aibyou ni Naru

Cynthia, the saint known as the "Spirit Princess Who Descended to the Empire" is actually a bit of a tomboy. One day, Cynthia decides to hide her identity and participates in subjugating monsters, but is cursed by a monster and turns into a cat!
What's more, she was picked up by the emperor, Isaac, who was hostile to her, and became his pet...
Immediate execution if it's discovered she's the saint?!