Jinsei wo Yarinaoshita Reijou wa, Yarinaoshi wo Yarinaosu.

Marquis’ daughter Keira vi Shandis is suddenly informed by King Regulus that their engagement is annulled. She is then imprisoned for a crime she didn’t commit. However, with the help of Lyuzie, a demon of time and shadows, she gets the chance to redo her life. In her second life, Keira is loved by King Regulus and gains a happiness anyone would envy. But something still doesn’t sit right with her, so she begs Lyuzie to return her to her first life—!? Abandon the happiness she was given, and reclaim her pride with the demon at her side!! Source: MU