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Hellsing, a secret organization within the British government, has long been battling supernatural threats to keep people safe from creatures of the night. They have a secret weapon in the form of an incredibly powerful vampire Alucard.

By judging the darkness of a ring around a person’s neck which only she can see, Michiru Kita knows how close a person is to their death. She notices that two of her classmates: Chika Akatsuki and Shito Tachibana, that both already have gravely dark rings around their necks.

Michiru Kita is a special girl who possesses Shinigami Eyes, a power which allows her to see a person's proximity to their destined death by seeing a ring, invisible to normal people, around the person's neck. When a person is marked to die, a gray ring appears, which darkens over time.

Shibusen, standing for Death Weapon Meister Academy (DWMA) the technical school for Reaper Armsmasters that operates from the deepest recesses of all the corners of the world, in order to prevent the second coming of the so-called Demon God who is feared upon bringing destruction of all humankind and envelop the world with nothing but madness and darkness. The reaper built this agency for weapons and for those who will be trained to wield them.

Alucard is not just any immortal, but probably one of the oldest and strongest beings known to exist. This vampire, however, is duty bound to the Hellsing family, who acts as the dogs of England's queen, protecting the country from the most dangerous parts of the underground, namely other vampires.