Manga Like Senketsu Oujo, Mina Korosu

Mary is a princess who lacks the ability to use magic. Her arranged political marriage was set in stone, and she hoped to finally serve a purpose as a member of the royal family. However, during the engagement party, her engagement was abruptly broken off, and she was falsely accused of a crime and sentenced to execution. Betrayed by her own parents and brother, Mary manages to escape with her only ally, her older sister. Their attempt to flee is thwarted, and both Mary and her sister are killed by the most powerful mage known as the arcanist. But on the brink of death, Mary’s powers awaken. She possesses the arcana of the Death God, allowing her to devour corpses and augment her strength. With this newfound ability, Mary becomes determined to exact revenge on all those responsible for her sister’s death.