We restrict accesses when its user-agent string is "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" and its HTTP_REFERER is empty, since many users which matches this condition have been fetching our pages in quite an improper manner. Please take a look at a page about the client (in Japanese). Please use another browser or read the page from some link pages. We are sorry for your inconvenience.