Angelo's Stand ability was brought forth by the mysterious bow and arrow, and apparently they're also connected to DIO. After defeating Angelo, Jotaro thought that the danger had left the city, and tries to find the whereabouts of the bow and arrow. A few days later, Koichi is walking home with Josuke, and they pass a house that should be empty...
I couldn't sleep that night...
...تِلك اللّيلة، أصابَني الأرق
In dieser einen Nacht
konnte ich nicht schlafen.
Esa noche tuve problemas para dormir…
Esa noche tuve problemas para dormir…
Quella notte non riuscivo a chiudere occhio...
Naquela noite, eu não 
conseguia pregar os olhos.