Black Blood Brothers

Vampire Jirou and his brother Kotarou set sail to Yokohama. Kotarou being a restless kid starts wondering around the boat and stumbles upon a fight between the suppression team, and the vampires. Jirou comes to stop the racket, but a grenade knocked Kotarou off board. Jirou dives after him but due to his blood, water injures him.

Jirou survives the water and bring his brother to the beach as a skeleton. They then meet a compromiser named Mimiko, who promises to take them to the special zone. Wong then appears and request that Jirou would join her, but then the suppression team arrives and shoot’s Wong in the shoulder. Jirou escapes with Kotarou and Mimiko, but then leaves to distract the suppression team as his brother escapes.

Ordinarily, humans won't evolve unless they drink the blood of a black blood. However, they can change humans by sucking their blood and turn theam into the same bloodline as the black blood. If they ignore that existance, the world will be ruined.

Jirou is still trying to get Katarou, but he is weak. Will he be able to save Katarou in time and destroy the kowloon child?

The place where Mimi works at finds out about her assisting Jirou, so she leaves and tries to find Jirou and Katarou a place to stay at. But during this they get attacked by some vampires. Will Jirou be able to beat them and protect Katarou and Mimi? Or will he perish in the attempt?

Jirou learns about the order of criminals called Kabun, led by an old acquaintance of Jirou called Zelman. What will happen when Zelman and Jirou meet?