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...
You two are in front of my house...
...أنتُما تقِفان أمام بيتي
Was macht ihr
vor meinem Haus?
Porque están en mi casa.
Porque estáis en mi casa.
Vous êtes devant chez moi.
Siete davanti casa mia...
Afinal, vocês estão na 
frente da minha casa...