The villain culprit behind this is the boss "Diavolo" whose stand is "King Crimson" "time erase". He doesn't want his identity found out. You have to protect the boss' daughter "Trish". Polnareff a fellow stand user is waiting with the Requiem arrow.

You are going with your friends: ["Bucciarati" is "capo": Stand: Sticky Finger]. ["Giorno Giovanna": Stand: "Gold Experience"]. ["Guido Mista": Stand: "Six Pistols"] ["Narancia Ghirga": Stand: "Aerosmith"] ["Abbacchio": Stand: "Moody Blues"].