Thus Spoke Kishibe Rohan - Episode 10: Hot Summer Martha

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! (Source: VIZ Media)

Rohan goes to a sports gym and runs into a man with a big secret. Note: The chapter was later changed to Episode 9 in the tankoubon release.

A woman named Mitsuki Murase, afraid her husband will discover her unfaithfulness, is attacked on the road by a white van. The driver, none other than Rohan himself, tries to warn her that a prominent climate activist is hiding in her car, using her as transportation for a terrorist plot. The ensuing crash leaves Rohan nearly immobilized, forcing him to choose between the eco-terrorist's noble goal and the well-being of his hometown. (Source: JoJo's Bizarre Encyclopedia)

The spin-off focusing on Kishibe Rohan, an eccentric mangaka with the ability to read people's memories, an ability called "Heaven's Door." He seeks out the supernatural to see for himself what his mysterious ability is all about. Volume 1 - Episode 16: Zangeshitsu (At a confessional) - Episode 02: Mutsukabezaka (Mutsukabe Hill) - Episode 05: Fugou Mura (Millionaire Village) - Episode 06: Mitsuryou Kaigan (Poaching Seashore) - Kishibe Rohan Gucci e Iku (Rohan Kishibe goes to Gucci) Volume 2 - Episode 04: Mochizuki-ke no Otsukimi (The Harvest Moon) - Episode 07: Getsuyoubi - Tenkiame (A Rainy Monday) - Episode 08: D.N.A - Episode 09: The Run Volume 3 - Episode 10: Hot Summer Martha - Episode 11: Dripping Gahou (Drip Painting Style) - Episode 12: Bruschetta