Black Blood Brothers(2006)

BLACK BLOOD BROTHERS

A decade has passed since the war between humans and vampires, when the infectious bite of the Kowloon Bloodline set the streets ablaze. Today, Jiro travels to the Special Zone, where the peace between vampires and humans is threatening to crack. As a new battle erupts between human soldiers, vampiric refugees, and Kowloon Children, Jiro must draw the Silver Blade once more.

(Source: Funimation)