"Breaking the Engagement? Yes, Gladly" - The Rare Villainess Who Possessed a Timid Young Lady Runs Rampant Undefeated

Celestine d'Alban was executed as a rare villainess of her age. However, in the afterlife, she was pointed out to have "a soul too white to send to hell, yet too black to send to heaven," and she came to work under a request from God (or so they claim). God's (or so they claim) request was to prevent the person she possesses from taking their own life. And so Celestine possesses a gentle and timid young noblewoman, and struggles to overturn the declaration of a broken engagement.