There is so much advises and so much answers from different different persons like i am the one of them if u want to find the companies who export there goods to japan as my opinion u have to find the companies first who actually sells goods of japanies companies so u may find the way from that companies after taking with them or meeting with that companies they help you much better then us they tell you the name of companies who exports the goods to japan and why japan takes goods from that companies what was the reasons which makes japan more intreseting to buys their goods from that companies why they should not make their good own self may be it helps you to clear your other things also