You'll note, however, that the last train you could take leaves Tokyo Stn at 8 PM. There are no buses still running from Iiyama to Nozawa by the time you get there. The last bus leaves Iiyama at 6:55PM. http://bit.ly/2vREiDR You will likely need to stay in Tokyo or Iiyama for the night.
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http://www.japan-guide.com/e/e6016.html
As an example, from Haneda Airport:
http://bit.ly/2uRGfCZ
You'll note, however, that the last train you could take leaves Tokyo Stn at 8 PM. There are no buses still running from Iiyama to Nozawa by the time you get there. The last bus leaves Iiyama at 6:55PM.
http://bit.ly/2vREiDR
You will likely need to stay in Tokyo or Iiyama for the night.