The stage of" Mikakunin De Sinkoukei "is Koriyama, but Koriyama station appears in the final story. (Episode 12 4 minutes 29 seconds)
Hakuya came home to the mountain without saying anything suddenly. In order to follow Hakuya, Kobeni takes a train from Koriyama station and heads to Hakuya's parents home.
Hakuya's parents home is in the mountains of Aizu.