Journey from Niseko to Yamagata

Hello there,

I've got some good news for you, the JR Pass does cover the full route!

Could you show me what you found or thought why it would not be included, this way I can explain :)

First, take the JR Hokkaido to Shin-Hakodate-Hokuto station, there you can get on the Hayabusa Shinkansen to Omiya, from where you can use the Yamagata Shinkansen.

Hope this helps,
Daniel