Whether or not you consider Rohan to be Araki's self insert character & true favorite JoJo, he's the only character to get his own spinoffs.
Despite the 2013 date, Araki says, in the end of chapter 1, that he started writing this in 1997, & only in 2013 did he have enough short stories to publish a full Oneshot. While some of the story takes place right after the chapter of DIU where Josuke tries to cheat at dice, there is a dramatic art shift away from DIU's relatively cartoonish style.
I guess this would be comparable to Tales from the Crpyt, or a more macabre spin on The Twilight Zone.
Remember that ridiculous chapter in DIU where an androgynous little boy in a Hot Topic jumpsuit made Rohan play an extremely dramatic game of Jan Ken Pon? Well you get that here, but with popcorn & poltergeists.
Rohan's got come baffling reasons behind a land purchase that comes off as mental gymnastics.
In DIU, he accidently burned down part of his house & blamed it on Josuke. After spending money on repairs & selling all his otaku paraphernalia, he spent his entire fortune on 6 mountains he wanted to research to prevent a road from being developed through them, thus devaluing the land & leaving himself broke with land he could ONLY sell to the very people he didn't want getting the land. What did he want to research? Demons. He is convinced that demons would puss out & leave the entire 6 mountains if humans built a tiny road through it.
Would the land itself tell him more than research books? Unlikely, but he insists on the reality of first-hand experience as his source of inspiration. Also, is one of those mountains where the billionaire village is?
Gunpei's death was really confusing, but it turns out it was supposed to be. After two people die swiftly from merely tapping their heads lightly against blunt objects, I realised the part Araki said about this not being intended to be part of the Jojoverse was true, at least for the first two stories. Rohan was shoehorned in to bring cohesion to otherwise unrelated stories, but this can't be the same reality where stand users eat fatal wounds like breakfast cereal & march on.
For as well as Araki draws bodies & backgrounds, he sure makes the worst looking blood I've ever seen.
Chapter 3 has Google Earth in it. This made me realize 2 things. 1)DIU, which was made when the internet was in its infancy, never once mentions the internet, nor does anyone in it ever use a home computer. 2)No matter how long you look around Japan on Google Earth, you will never find a backyard swimming pool.
Also in chapter 3, there is this this gimmick. Etiquette is posh/classy ritual formalities & choreographed gestures learned through repetitive training, like how to fold a napkin, or which fork, knife, & spoon are for certain meals. Manners are the act of being considerate that any low-born heathen can do, like holding a door open for someone behind you, or not pulling out of a driveway & turning a corner at 2mph when a car is getting closer.
Chapter 4 is blessed because Tonio Trussardi from DIU is in it. He was the best underutilized gag character of the series. Never before (probably) have you seen two men get their asses kicked by clams.
Chapter 5 is in full color & was apparently commissioned by Gucci of Japan, & has the most ridiculous poses I've seen since Battle Tendency. Rohan uses a fountain pen & a rock to light a fire on fire.
Chapter 6 was clearly translated by a different person who's first language is definitely not English. All of the girls in this chapter kinda look like Rohan, except for the grandma whom looks like Jabba the Hutt.
Chapter 7 is social commentary on how people can't be assed to look up from their phones for 2 seconds. Reading it gave me flashbacks of the Amazon campus in downtown Seattle. No one looks to see what color the light is or if a car is coming, they just cross the street with their phones glued to their faces.
Chapter 8 brings the old & the new; the return of Yukako & another shift in art style.
Chapter 9 is definitely The Twilight Zone.
Chapter 10 is about the douchiest Gym Bro in Japan, whom is in his underwear most of the time. It's literally the Virgin vs Chad Meme, even came out the same year. Rohan is sporting a gigantic torso with the world's shortest legs. If you told me this chapter was just an excuse to draw a hot naked guy posing, I'd believe you.