Toreiyu Tsubasa with Ashiyu (Footbath).
Joyful train Yamagata-Fukushima, only operate on the weekends.
This shinkansen is covered by JR East Pass.
Don’t forget to reserve the tatami room car, and reserve also the footbath ticket in car 15 with ¥450/person for 15 minutes.
The best reserved time is near sunset 🙂
AloJapan.com