Ten years after the Holy War in Hong Kong, Mochitsuki Jurou, aka the Silver Blade, and the lone hero who fought and defeated the Kowloon Children despite the loss of his lover, returns to Japan with his young brother, Mochitsuki Kotaro. The two quickly discover that the Kowloon Children who survived the Holy War are seeking to infiltrate the “Special Zone”—a thriving city protected by an invisible barrier that will not allow Kowloon Children entrance—unless they’re invited. Red Bloods refer to the humans; Black Bloods are the vampires, and the Mochitsuki Brothers are Old Blood—the last descendants of an elite clan of vampires. When Kotaro is abducted by one of the Kowloon Children, Jurou has no choice but to fight once more.