Black Bloods and Red Bloods - once foes - had united against a common adversary. Jirou Mochizuki, a celebrated vampire warrior also known as the "Silver Blade," and his brother, Kotarou, now travel to the Special Zone, a haven where humans and vampires coexist peacefully. Their expedition turns perilous as a clash erupts between human troops and vampire migrants in the Special Zone. Jirou faces mounting danger as an erstwhile foe plots against him. With the help of his newly forged bond with Mimiko "Compromiser" Katsuragi, and the formidable power of his ancient lineage, Jirou must safeguard his most cherished possessions.