[SingaporeanJP]

For searching for escorts in Japan, personally, I use:
(please use google chrome, install google translate extension and you can read everything)

fuzokudx
fujoho

I speak ok japanese so I can try booking with these places... I have not tried by just using English.

For 100% foreigner friendly places, most reliable is tokyonightstyle (im legit not promoting my working place xD) But please check the shop properly before you proceed there are some with fake profiles.