An old blood vampire that sided with hunams to fight against the kowloon children during the Kowloon shock. jiro was transfored into a vampire in 19th century london. he used to be a lietenant in the imperial japanese navy until he was severely injured in a fight protecting Alice. besides being an old blood, he also comes from a very special bloodline: the blood of the sage. he wields a long  katana which has a blade made of silver. during the war, after defeating most of the kowloon children, he became known as the silver blade. he is weak against sunlight and water. he is shown being bured to the bones from staying into the ocean too long and releasing smoke under the sunlight, even though he was carrying an umbrella. he has a little brother, Kotaro, who is the only other vampire who shares his bloodline. he is considered to be chosen guardian.