Hey Jun,
I don't think you'll remember me, but I visited your dojo a couple of times 2 or 3 years ago (tall, skinny, red hair from Detroit). Katsumi Niikura is my sensei. If your looking for info, the best place to look is the web site
www.ryokukai.com
You'll find the contact info there. From what I remember, your nihon-go is excellent. His english is broken and hard to understand some times, but feel free to give the dojo a call and ask for him(speak japanese with him, he'll appreciate it!!)
Nate