The Myoko City website has detailed information and guides on how to get to Myoko by train. They also have detailed train timetables listed. Please check their information.
These bus services hopefully will resume for the 2021/2022 winter season, possible around mid December
From Narita or Haneda Airport only (Shared with other travellers (max 7) , Private hire is also available).
It is possible to rent a car and drive to Myoko. Please read the guide on the city website for full details and things you should look out for.