Funny, I can't get the link to this image to work, nor have I been able to with some of the other derivations on his work. Is there a trick to it these days? And how was this found, if you don't mind my asking?
Go to the regular "5.jpg" version, then modify the URL to "5.1.jpg". I found it with a quick javascript page I made that checks various variations of the filename, that I check whenever he adds a new picture.
Might be because geocities.jp has some hotlink protection, so you'll get an error page if you follow a link, but if you paste the URL in the browser it should work. However your browser might be caching the error page, forcing a refresh or clearing the cache may help then.