Don't worry, you'll most probably be able to buy tickets even on the day of the concert (and if there are some vacant far back sits you may even pay less than the standard price, but that's just the last resort, you don't have to buy on the last day), it's not worth importing tickets to your country, I know it may sound crazy to go to Japan to Ayu concert without ticket (esp if that's the only reason for going there) but that's cheap and safe way.
I'd go this year myself too, unfortunately there's no one to go with me this time and that's discouraging me a lot <(_ _)>
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