Its said to be available here:
虎の穴http://www.toranoana.jp/mailorder/article/04/0030/23/11/040030231192.html
メロンブックスhttp://shop.melonbooks.co.jp/shop/sp_212001075842_makegumi_onesatu4.php
グレップhttp://www.grep-shop.com/tsuhan/
げっちゅ屋http://www.getchu.com/soft.phtml?id=823389
