Six decades ago, a peculiar case of insomnia afflicted the population, compelling them to remain awake for over a full week. The victims, entirely sleep-deprived, all descended into madness. To treat this condition, a new medicine was developed, yet its side effects transformed the patients into vampires. Humanity waged war against this new species and emerged victorious, although some vampires managed to survive. Mi Liu, known as "The Child of Hope," is born of a human and a vampire, destined to embody the new hope that will bridge the two species. As the ringleader of a bank robbery, Mi Liu is arrested and transferred to a special prison operated by the National Defense Agency, which monitors vampires. Attempting to escape with Anji, Mi Liu is attacked by strange monsters and discovers that the prison is located at the birthplace of vampires, the former capital "Blue Town." Why are vampires confined in Blue Town? What are those strange monsters attacking them? Our heroes must fight to unravel these mysteries.