In the treacherous frontier city of Samurai Town, a ruthless bank robber is sprung from jail by wealthy warlord The Governor, whose adopted granddaughter Bernice has gone missing. The Governor offers the prisoner his freedom in exchange for retrieving the runaway. Strapped into a leather suit that will self-destruct within five days, the bandit sets off on a journey to find the young woman—and his own path to redemption.
Manami suddenly encounters mass murder at a pub on her 22nd birthday as she is hunted down by two warring vampire clans, the Draculas and the Corvins. Manami is a child of prophecy who is meant to help the Draculas overcome their Corvin enemies who have driven them underground. Meanwhile, droves of young men and women are gathered at the Hotel Requiem by a Corvin named Yamada who informs them that the world is about to end, with this hotel being the only refuge.
About 150,000 illegal entrants live in Tokyo. They are not recognised as refugees and live in poor conditions. To protect themselves, the illegals create a secret organisation. The organisation has a bank which Japanese Financial Services Agency is not involved with, a hospital that is not authorized by Japanese Ministry of Health, Labour, and Welfare and an illegals police force called "Dias Police." The only police officer in the organisation is Saki Kubozuka. His age and nationality is unknown. Saki Kubozuka does not speak much, but he has a warm heart and strong sense of justice. He takes care of the weak and tries to maintain public order.
One day, struggling model Kurusu Reina suddenly has the special vision to see images of murderers come to her mind. Asano Kazama, a First Investigative Division detective, pushed into temporary suspension because of a case, unluckily meets Reina. He makes use of her unique ability to solve difficult cases.