During a war called the Hong Kong Crusade, an Old Blood, Jiro Mochizuki, a.k.a. the Silver Blade (Gintō), fought and defeated the Kowloon king and most of the Kowloon Children. Ten years later, Jiro heads to Hong Kong with his little brother, Kotaro Mochizuki, in hopes of reaching The Special Zone, a thriving secret city where Vampires live. They soon realize that a plan to infiltrate the Special Zone is being hatched by the Kowloon Children survivors. As they travel to The Special Zone, Jiro encounters enemies from the past and new threats that may endanger the safety of the Special Zone. The abduction of Kotaro, by one of the Kowloon Children, thrusts him even further into the battle. Along the way, he meets a girl named Mimiko.