Half Metal Heart (Jotakak Part 4 AU)

It's been 11 years since Egypt. 11 years of guilt-filled days, silent meals, and avoiding any sort of connections, just so Jotaro won't get his heart broken again. Eventually, he grew up and pursued his passion for marine life while becoming one of the most important allies of the Speedwagon Foundation.
Now, he's in Morioh, working with his "uncle" to find and take down a notorious serial killer in the area. The work has kept his mind busy, so when he receives an odd fax one day, he doesn't think anything of it. But when an old friend returns to the scene with serious changes, will they be able to return to how they were before? Or will there be too many differences between them now?

(Cover background art by u/tenkensmile on Reddit, all characters belong to Hirohiko Araki, please don't sue me