Ghost

Ezra rises from the dead as a Ghost, finding Earth in ruins after a war between Angels and Demons. He remembers the death of his friend and mother at the hands of the most powerful vampire in the world, and escapes from Hell to kill him. After learning about the state of Earth after Armageddon, though, he decides to join a group of Ghosts that slay monsters, demons, and vampires called "Eos", and fights to protect the surviving humans. Ezra's sole focus is the same, though. Kill the vampire that killed him.