Black Bloods and Red Bloods, vampires and humans. Though distinct, these two peoples once united in a campaign against a powerful adversary. Ten years later, the vampire combat legend Jirou Mochizuki—dubbed the "Silver Blade"—journeys with his younger sibling Kotarou to the Special Zone, a sanctuary where vampires and humans coexist peacefully.
Yet their expedition abruptly encounters peril when a clash ignites between vampire refugees and human troops from the Special Zone. As an old foe"s plot unfolds, Jirou must enlist his new partner Mimiko "Compromiser" Katsuragi and draw upon the might of his ancestral lineage to safeguard what he holds dear. In the face of looming darkness, he vows to safeguard his family's legacy and the peace.