Thanks for clarifying.
Mitsui Chemicals opened up two marketing branches on October 1st. One in South Korea and another in Taiwan:
https://uk.finance.yahoo.com/news/mitsui-chemicals-establishes-marketing-korea-020000217.html
http://www.chinapost.com.tw/taiwan/business/2014/10/02/418510/Japanese-firm.htm
If a Japanese firm is looking for graphite, Mitsui Metals & Mining, or Sumitomo are a few of the major Japanese mining players.