For over a century, the Hellsing Organization has been secretly protecting the British Empire from the undead "freaks," When Sir Integra Hellsing succeeded as the head of the organization, she also inherited the ultimate weapon against the undead enemies, the rogue vampire Arucard. Although his signature weapon is an enormous "anti-freak" gun called Jackal, he is a "true" undead with mysterious and frightening powers, which includes the ability to transform himself into bats and other creatures. While on a mission ordered by Integra, he is forced to shoot Seras Victoria, a policewoman held hostage by an enemy vampire. "Do you want to live?" he asks Seras, whose very answer changes the course of her existence. Now reborn as Arucard's servant, Seras is torn between her conflicting humanity and her vampire urges.