Tickets To Ayumi, With friend In Japan

[AyumiAi]

"Having a friend in Japan. You could ask this friend to go to a ticket reseller store and buy tickets for you, which he could either mail or hand over to you when you arrive. Possibly you could have this friend call and buy tickets on the official release date. Maybe you could even join Team Ayu through him/her and preorder tickets"

This is from the How i made it to Arena Tour 2006

I have a friend In Japan who will buy my tickets for the Yokohama concert on the 14th of May. What i wanted to know is where they should call if they want to buy the tickets on the official release date, and if they can pick the seats.
Is there ANY WAY to pick your spots for the concert VIA official stores or websites, not resale stores?