Black Blood Brothers

Summary: 

    During a War called the Hong Kong Crusade, an Old Blood vampire, Jiro Mochizuki, aka the Silver Blade (Gintō), fought and defeated most of the Kowloon Children. Ten years later, Jiro heads to Japan with his little brother, Kotaro, 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.