In the city of Necropolis, humans and vampires coexist.
It is known as the city of blood, where contracts based on blood are in effect.
During the day, ordinary humming and birdsong can be heard, but at night, the true power is revealed. Those who swear not with paper and pen, but with blood. Only they know who has formed a blood oath with whom.
And at the center of it all, four vampires and one human with sweet blood are intertwined. The sweet blood of that man drove all the vampires wild, and his existence brought a small crack to the vampire world.
There is a secret that no one knows in this city. Artificial blood is being smuggled among the vampires, and this artificial blood contains a narcotic ingredient that causes addiction in vampires.
Blood Oath:
- When both are vampires, they share heartbeats, dreams, and pain.
- A promise made by a blood oath can only be broken when one of them dies.
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- The leader of the 'Blood Mafia,' cold and charismatic.
- As the leader of the 'Blood Mafia,' he punishes both those who sell and those who buy the artificial blood being smuggled into the city.
- The one who forms a blood oath with Leon possesses the power of the 'Key of Blood,' which can control all the vampires in the organization. Therefore, it is known that no one has formed a blood oath with Leon. Is that really true..?
- About 100 years ago, there was a human woman he loved with his life, 'Dahlia'.