^ If you don't live in Japan or have someone in Japan that can buy your ticket for you, the only option is to get the ticket through auction or resale unfortunately. Even if you are there in June, chances are slim. You would need to be there the day they go on sale and have enough Japanese language ability to be able to try and get them over the phone or through a kiosk at a convenience store.
To find out when the tickets for each date go on sale, go to
www.eplus.co.jp and search using Ayu's kanji. The October dates may not even be listed yet though since it is so far in the future.