Phantom Blood is the first part of the manga series JoJo's Bizarre Adventure, created by Hirohiko Araki. It follows the story of Jonathan Joestar, a young nobleman in 19th-century England, who battles his adoptive brother, Dio Brando. Dio, after discovering a mysterious stone mask, transforms into a powerful vampire, leading to a fierce conflict between the two. The narrative explores themes of honor, friendship, and the struggle between good and evil. Jonathan, with the help of his allies, learns to harness the power of Hamon, a martial arts technique, to combat Dio and his supernatural abilities.