On 5 September, when Pak Rikoo and Pak Bagus arrived at Narita,
please do the procedure to apply for residence card (zairyuu card),
I am not sure about the place, but may be at immigration you can ask.
Then if the residence card can not be done on that day,
your passport is going to be stamped "On Process, is going to printed"
or something like that.
The stamp is neccesary for the
procedure of certified copy of resident register (zumin hyou)
which is going to be processed at Kanuma City Office.