JoJo's Bizarre Adventure is a Japanese manga series written and illustrated by Hirohiko Araki. It was originally serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from 1987 to 2004, and was transferred to the monthly seinen manga magazine Ultra Jump in 2005. The series is divided into a total of nine main story arcs, each following a new protagonist bearing the "JoJo" nickname. JoJo's Bizarre Adventure is one of the largest manga series by number of volumes, with its chapters collected in 139 tankōbon volumes as of March 2026.