From the introduction: Jojo's is a story centered around the Joestar family line and the ridiculous situations they find themselves in. Ripples, vampires, super vampires, stupidly complex spiritual manifestations, a two-month long horse race, and more! Almost all named after progressive rock bands. There's a little jargon that'll get thrown around surrounding the abilities of the various Joestars that can be hard to grasp on first read, so the first four pages of this [document] cover that. Thereafter are the rules.