I'd be suprised if they even reply to that letter, I'm sorry to say. You come off as way to much of a fanboy and for Avex to take you seriously, you needed to send them a resume and portfolio of your work.(along with everything else that was listed as requirements on that audition page) Also, I'm not quite sure how you expect to get into Avex with those Sels? Not that they aren't good, but why would Avex need them? Just some things to think about and I'm not trying to be mean - it's just that for a serious job like this, if you really expected to get it, you should have thought it through more.
Also, why didn't someone post that audition link sooner? I would have sent them my stuff.