Gisaburô Sugii

Lupin comes into the possession of half a diamond containing half a map, and goes in search of the other half so that he can obtain the map's treasure.

Kazuna's family is cursed with a disease that makes them thirst for blood. Unaware of this, Kazuna was sent to live with the Eda couple as a child. When Kazuna's teenage hormones begin, he starts to struggle with his blood lust.