I didn’t think they let moslems into Japan.
There are many there.. Less than a decade ago, Kurds were attacking the Turkish embassy over some controversy or another (I think it was something to do with elections). It was in Tokyo, if I remember right.
Also, just go to Shibuya (or anywhere around Tokyo Tower) any day or night, and you will see a couple of Pakies every block (on the backstreets) dealing drugs.
They also are the used car salesmen, believe it, or not.