We would like to take the train from Hiroski to Kakunodate but would like to confirm if the route from Hirosaki to Akita covers by JR pass. Also, will we able to the reserved seat on April 30 for May 1 day travel since it is busy travel time.
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You can find more info on the Tsugaru at
As for seat reservations, you can make them up to one month in advance as long as you have your activated pass or ticket. Or for JR East trains you can do so online.