Jojo's Bizarre Adventure : Mystery Ghouls follows the story of Boas Crawford, a young boy from the countryside very interested in the occult. After hearing about strange corpses being found in the streets of London, Boas sets out on a journey to find out who - or what - murdered these people.
Soon, he meets an eccentric man that claims to be a "ghost hunter", who claims to possess psychic powers, and is swiftly persuaded to join him. However, there is more to this story as it seems, as mysteries keep piling up one after another, and a strange figure keeps attacking Boas and Mauricio from the shadows...
JJBA: Mystery Ghouls offers a unique sidestory to the famous hit manga Jojo's Bizarre Adventure, written by Hirohiko Araki. A big part of the story is the difference in morals between Boas and Mauricio. While Boas searches for the supernatural mostly out of curiosity and looking for proof, Mauricio is after the supernatural for selfish and personal reasons, and will not hesitate to do anything - even kill - to accomplish his goals. Although their differences in both experiences, morals, lifestyle and age are great, the two still develop a weird bond over their shared love for the occult.