Haha I had around the same experience as you, I only arrived in Japan on the night of 26th of July, almost had anxiety attack worrying if the ticket I want will still be there the next day.
I rushed to Ueno Reseller shop the very next morning. I spent 40 000yen on my ticket for the FINAL show on 28th, G block, I am short so I didn't really wana stand in the Arena seats.
Awesome awesome experience!! I was watching the concert with the light stick in one hand and a tissue in the another coz I was so overwhelmed that my dream to see her after 12 years came true!
I will definitely go back to Japan again, totally in love with it!