Coca cola have barely any ground in Japan, and Japanese vending machines are about a quarter the price of countries where Coke is prevalent. Most drinks are ¥110 to ¥150 at the moment... which is like... a buck.
Coke is not the only thing being sold in these vending machines. Irohas and Georgia coffee are all owned by Coca-Cola, and they’re everywhere.
Prices have gone up a lot recently (it’s more like ¥150-¥180 now, in Osaka at least) and this would send the prices up more - just think things like the prices for water shooting up in the middle of summer.
It's weird how exchange rates don't reflect a person's hourly worth.
I'm in Australia and a coke from a vending machine on a train station platform is $4.50, which is ¥435 at the current rate. A bottle of water costs the same, because... Coke.
I honestly bought a 600ml ¥100 water in a Kyoto tourist trap in July this year. A vending machine on the street.