Thus Spoke Rohan Kishibe is an OVA Manga about the side-stories of Rohan Kishibe, a very influential figure in DIU (JoJos part 4). If you want to read any of this, you need to watch/read Part 4 first. That being said, I read this before the Anime adaptation (which was okay), but I prefer the source material. Thus Spoke Rohan Kishibe is a collection of side stories, set some years after Golden Wind/Vento Aureo. There is some great subject matter here, and I'd hate to spoil it. I will say this though: If you are a fan of bizarre, stand-only horror mangaka (Ex. Junji Itou), thenthis is right up your alley. Still, I'd recommend this for any JoJo fan that has finished Part 4.