Main characters: Diavolo, Dio, Jotaro, Giorno
After Jotaro, Dio, and the others finished the main storyline, defeating the priest in Season 6, they accidentally unlocked a dungeon: Ten Days in Jo'en.
That's right, they had arrived in the legendary forbidden land, Jo'en.
Jotaro, Dio, Pucci, Jolyne, Joseph, Diavolo, Giorno, Josuke Higashikata, along with some supporting characters under pseudonyms,
And their Stands: Star Platinum, The World, King Crimson, Hermit Purple, Crazy Diamond, Made in Heaven, Stone Free, Gold Experience, and more. They have only one mission: survive. Jojo-ness is no longer something they can trust so easily.
Echoes will appear as usual and can still be used. Kill the other side to stay alive.
And as for those overpowered Stands, don't ask me why I made them so overpowered. If you must ask, ask Araki. He's the one who made them.