Tensei Mofumofu Reijou no Mattari Ryouchi Kaikakuki: Cool na Oniisama to Amaama Slow Life wo Tanoshindeimasu

The crown princess Lune Renard has been captured by the revolutionary army, condemned to death as the vixen who threw the nation into chaos by hiding her past as a lowly orphan. However, Lune never wanted to be the crown princess, and her marquis adoptive father practically sold her to the crown prince. But as she and her family are executed, the Great Fox Spirit Reineke hears Lune's prayers and sends her back in time to avert this terrible fate. What's more, she now has fox ears that can hear the voices of spirits! Lune is determined to save her people, but she must first win over House Renard, the family that adopted her but always treated her coldly—especially her brother Liam. She was sure that Liam hated her, but now he's always doting on her! With Liam and the spirits by her side, Lune will find a happy ending for everyone!

(Source: J-Novel Club)