JoJo no Kimyou na Bouken Part 4: Diamond wa Kudakenai

From Viz:
In April 1999, Jotaro Kujo travels to a town in Japan called Morioh to find a young man named Josuke Higashikata, the secret love child of his grandfather, Joseph Joestar. Upon finding him, Jotaro is surprised to learn that Josuke also possesses a Stand. After their strange meeting, the pair team up to investigate the town’s proliferation of unusual Stands.