This looks like a pretty good one shot chapter if you ask me. I could see the story not being popular until part 5 drops in anime form. This has good grammar, pacing and characters are likeable enough to follow. It's a shame not many stories involve Diavolo as the protagonist in a story, whether they be in Jojo universe or a crossover. The only story that I can recall having him as a protagonist would be one with RWBY. Rather than do what most authors do by joining the cast he instead takes over the drug trade and slowly tries to take over the city through the underworld. Hasn't been updated in a while but I thought it was a good idea for story. From what I could theorize about the names on the graves they would have to be from his mom, wife and daughter. Having a what if scenario by having Diavolo win is an interesting concept that I didn't suspect when I read this story. I wonder why he's acting paranoid even though he has obtained the requiem arrow and defeated Giorno. You would would it would be smooth sailing from here on out. I know it's a one shot but I would love to see what the Jojo villains or minor antagonist due if they either won their battles or perhaps have a crossover with them. Good job!