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eConnect is one company that I used when I was in Japan that I know has that, and they use NTT Docomo network. (it's specified under network if you go to the prepaid SIM page). I went to very isolated areas in Hokkaidō and it worked fine
Best I have found so far is Foto Royale in Centro Commercial Fanabe. 2 x 1.5 GB Vodaphone sims for 30 euros valid for 30 days after first use. Overall expiry date October 2016 even if not used.
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