It's the early 20th century and Aoi is a young newspaper reporter investigating a series of grisly murders. When she gets too close to the culprit, she discovers that there is a secret team of vampires working for the military...and that one of the vampires is her supposedly dead friend! This team, known as Code Zero, is the government's best hope at stopping violence caused by other vampires. What on earth has Aoi stepped into?

"Weak Beings. They are called Vampires.

Set during the time of Taishou democracy. Four men are infected with the vampire virus. Their bodies are weak to sunlight, with low tolerance to strong odors, and can only consume blood. The weaknesses of these frail vampires will be compensated through the use of modern technology! The vampires, who are under the government's commands, soars above the Imperial City tonight!

Adapted from the musical stage play reading by Fujisawa Bunou."