If you make it over to Kyoto, I can offer some suggestions. I don't know any bladesmiths in Tokyo. Came across this site: http://www.teruyasu.jp/en/
but he's closer to Yokohama than Tokyo. Don't know if you can buy steel from him.
Usually the smiths here have to cooperate and buy together in bulk, no way to get it directly from Hitachi Metals that I know of.
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