During the Hirohiko Araki JoJo Exhibition: Ripples of The Adventure live stream, Hirohiko Araki, the manga series author, commented that JoJo’s Bizarre Adventure Part 5 anime will be coming October 2018. David Production will be returning as animation production for the series.
— TVアニメ『ジョジョの奇妙な冒険』公式 (@anime_jojo) June 21, 2018
Yasuhiro Kimura and Hideya Takahashi will be directing series with Yasuko Kobyashi as series composition, Takahiro Kishida as character designer, Shunichi Ishimoto as animation director and Yugo Kanno as composer.
The original manga series by Hirohiko Araki is ongoing since it’s debut in 1987 and currently on it’s eighth part titled JoJolion. The fourth series of the anime, JoJo’s Bizarre Adventure: Diamond Is Unbreakable, premiered in April 2016. The entire anime series is currently available on Crunchyroll.
MyAnimeList describes the fourth part of the TV anime series Diamond is Unbreakable:
The year is 1999. Morioh, a normally quiet and peaceful town, has recently become a hotbed of strange activity. Joutarou Kuujou, now a marine biologist, heads to the mysterious town to meet Jousuke Higashikata. While the two may seem like strangers at first, Jousuke is actually the illegitimate child of Joutarou’s grandfather, Joseph Joestar. When they meet, Joutarou realizes that he may have more in common with Jousuke than just a blood relation.
Along with the mild-mannered Kouichi Hirose and the boisterous Okuyasu Nijimura, the group dedicates themselves to investigating recent disappearances and other suspicious occurrences within Morioh. Aided by the power of Stands, the four men will encounter danger at every street corner, as it is up to them to unravel the town’s secrets, before another occurs.