JoJo's Bizarre Adventure (Japanese: ジョジョの奇妙な冒険 Hepburn: JoJo no Kimyō na Bōken) is a Japanese manga series written and illustrated by Hirohiko Araki, serialized in Weekly Shōnen Jump from 1987 to 2004 and in monthly seinen manga magazine Ultra Jump since 2005. The series is divided into eight parts, each following the adventures of a new protagonist bearing the "JoJo" nickname; the eighth part, JoJolion, began serialization in May 2011. The first six parts form a saga detailing the supernatural conflicts between members of the Joestar family and various villains, while the latter two parts follow a continuity reboot, taking place in an alternate universe with plot parallels to the original. The manga is Shueisha's second largest ongoing series by volume count, with its chapters collected in 125 tankōbon volumes and counting.