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...
It's my precious objective.
.إنّه هدفي الثّمين
Das ist mein wertvolles Ziel.
Forma parte de mi objetivo.
Forma parte de mi objetivo.
Elle sert mon objectif.
È la cosa a cui tengo di più.
Para alcançar meu 
importantíssimo objetivo,