S-Rank Throne: Princess Ascends

Lillian wakes up inside a novel as the Fifth Princess of the Elf Kingdom, a minor character who in the book is handed over to a vampire in a sacrificial rite in the first chapter. She wants to live past that scene. What she has instead is no standing at court and a sister, the Third Princess Lilia, who is already moving against her. By accident she breaks the seal on an S-rank vampire who has been shut away for a thousand years. He grants her one wish, and she asks him to follow her for the rest of her life. That is not enough on its own, so she sets about taking the things that were supposed to go to Lilia: the werewolf who would have served her, her place among the candidates for queen, and a fallen angel. Lilia gets away and attacks during the ceremony. Lillian puts her down, and Lilia calls up the most evil spirit in the kingdom. The Queen seals it at the cost of herself, and the spirit is still loose in the kingdom with Lillian left to face it.