The Immortal Covenant

Laura Kristeva, a demon vampire, tries to escape from the clutches of another race of vampires who use her for absolute immortality. She meets Justin Leonidas, a vampire hunter who is a descendant of The Founders, the world's first vampire hunters.
Laura's encounter with Justin was initially filled with hatred and lust to kill each other. However, in the end, the hatred and desire to kill slowly turned into the seeds of love.
The stronger the love between the two, the greater the danger threat awaits Justin and Laura. Because Justin must not violate the oath made by The Founders. If he violates, he must face severe consequences, namely death.