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A massive earthquake ravaged Japan's mainland and destroyed most of Tokyo, sinking three-quarters of the city into the ocean. Ten years later, the story shifts to Ganta Igarashi, a seemingly ordinary student attending Nagano Prefecture's middle school.

Yuki's earliest memory is of a stormy night in winter, wherein she was attacked by a vampire..

Yuki Cross earliest memory is of being attacked by an insane "Level E" type vampire and saved by Kaname Kuran, a pureblood vampire for whom Yuki tries to deal with her seemingly unobtainable love for her hero. Ten years later, Yuki, along with her childhood friend, Zero Kiryu are school guardians at Cross Academy where her adoptive father, Kaien Cross is the headmaster.

Cross Academy is different from any other school. It has a Day Class and a Night Class, with different uniforms and no interaction between these two classes.

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.

The Hellsing Organization, led by its current director and family heir, Integra wages a war against a revived Nazi group called Millenium. It's champion, a dark ancient vampire named Alucard enlists the aid of a new young vampire to conquer the evil.

After the unsustainable growth of the human population on Earth, the United Nations has opted to colonize Mars. During this expedition, the humans discovered two alien technologies: The Bacillus virus and the Crusnik nanomachines.

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.

In the night of Tokyo, mysterious deaths involving the 'Reborn Dead' occur. Mysterious transfer student, Tatsuma Hiyuu, and delinquent student, Kyouichi Houraiji, fight these undead every night.