Vampires exist. It is the duty of Hellsing, a secret organization sponsored by the British government, to hide the frightening fact and protect the blissfully unaware populace. Along with its own personal army, Hellsing has secret weapons. Alucard, an incredibly powerful vampire, has been controlled by Hellsing for years, It is unclear how he feels about being a servant to the Hellsing family, but he certainly enjoys his job as a vampire exterminator. Seras is a fledgling vampire and former police woman. Although reluctant to embrace her new self, she is a valued member of the organization. Integra Hellsing, the current leader, is usually fully capable of fulfilling her duty, but lately, vampire activity has been on the rise. Unfortunately, the cause is more alarming than anything she could have imagined. A group long thought dead has been plotting in secret since their apparent destruction over 50 years ago. Plotting to plunge England, and perhaps the entire world, into war.
Hellsing,是王立国教骑士团的代号。这是一个负责清除所有反人类、反宗教的怪物的特种部队,直属女王管辖。知道这个部队的存在的,也只有负责国家安全的“圆桌会议”的少数几个贵族和警察首脑。面对威胁人类的吸血鬼,他们的使命是——见敌必杀(Search and Destroy)!Hellsing目前的首脑是Integra,一位年轻而强悍的女性。直接效忠于她的,就是本作的男主人公——超级吸血鬼Arucard。
故事的序章,是从普通的女警Seras Victoria一次噩梦般的任务开始的……