777Efoh, JAS and JAL are one now (as of October last year), and both operations are effectively JAL although some JAS flights still operate with Air System callsigns.
The only airline of which I'm aware that recruits direct entry foreigners is Air Do (Hokkaido International Airlines) - they have a couple of 767's - however I'm unsure as to whether they take non-Japanese F/O's.
You need to do what we all had to do, write to each and every airline.
Best of Luck with your endeavours.