In the article of Nicebody.swf the website "House of Horror" (恐怖の館) is mentioned, and seems like there are a lot of links of different screamers archived on WaybackMachine. I'll just save it here for future reference.
http://web.archive.org/web/20040901031906/http://www.geocities.co.jp/MusicStar-Bass/6678/
Also
http://web.archive.org/web/*/http://www13.plala.or.jp/MUDAI/*