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

Saved from a lonely life as a poor orphan, Lune was taken in by House Renard. Yet try as she might to repay them, she was always treated coldly and kept at a distance, especially by her older brother Liam. When faced with financial ruin, the Renards sold her off as a bride to the crown prince, only for a revolutionary army to seize control of the kingdom and condemn her family to death.

At the moment of her execution, Lune makes one final wish for a chance to save them all. The Great Fox Spirit Reineke hears her prayer, sending her back in time and granting her fox ears that let her hear the voices of spirits. If she wants to change the future, Lune must win over her adoptive family—including Liam, who suddenly seems to be...doting on her?! With her spirit friends and Liam's affections, Lune sets out on a journey to avert her family's unjust fate and find happiness at long last!

(Source: J-Novel Club)