Worst case i suggest flying from ITM to NRT... it's a 1 hr flight and gets you into NRT. you might spend more time just in the N'Ex itself. There are various air pass that allows you get get that flight for 10K-13K yen depending on which air alliance you're with. Surely there are airport busses from either Osaka, Kyoto or Kobe that brigns your straight to ITM.