I’ll be traveling around Japan in May and a friend advised me to buy a green JR pass instead of a normal one because he said reserved seats tend to be sold out in the high season.
When I looked it up, answers seem te differate. JR says that May, August and September are the busiest months to travel by train but on some tourist sites May is classified as a medium busy month.
How likely is it you think that seats are sold out during May? And is standing avoidable is you travel really early or late?
Any experience or answer is appreciated