Hi, I will be in Koyasan on August 9 (Friday morning), and need to be in Sapporo by the end of the day Saturday. Ideally, I'd like to take an overnight train on Friday. Do I need to go back to Kyoto, or is there a better way to connect to the main line from Koyasan? Also, is it possible to reserve seats on an overnight train in advance?
Thanks for any advice. I'd like to use my JR Pass as much as possible.