Arisa first appeared on a Japanese TV show called "Tokuhou Oukoku," which was a weekly program that featured various amazing people, places, and things. For a while they were doing a series of big-breast stories: "Japan's bustiest high school student," "Japan's bustiest junior high school student," "Japan's bustiest office lady" (actually a porn actress posing as an amateur), and "the world's bustiest woman" (actually Pandora Peaks posing as herself). Arisa appeared as "Japan's bustiest nurse." Any screencaps or video clips you've seen are from a second segment she did featuring "Japan's bustiest nurse's mom" (busty, but nowhere near Arisa.. Japanese F-cup). In this segment the narrator claims Arisa is "still growing." In addition to "Tokuhou Ookoku" Arisa also appeared on 2 late night shows, "Tonight," and "Shitsuren Resutoran." I've never seen any caps from either of these shows. I've heard two conflicting accounts of her "Shitsuren Resutoran" appearence. In one, she complained that men were always attracted to her solely for her big breasts; in the other she just said she was having trouble finding a boyfriend, but no comments or mention was made about her breasts.
Arisa also appeared in at least 1, and probably 2 weekly photo magazine articles (probably Flash or Friday). Several black-and-white and 1 color image from those articles have circulated around the Internet.
All this took place in and around 1994. Then she seems to have disappeared completely. Over the years I've posted on several Japanese web boards, asking for more information or images, as have many others, but to no avail.
Here's what we seem to know about her:
Name: SAOTOME Arisa
Date of birth: approximately 1974
Height: fairly short, probably less than 160cm
Measurements: 103-54-87
Bust: Japanese L-cup
The TV shows and magazine articles all reported that she worked as a nurse at a hospital in Kyoto, where she enjoyed going out to discos in her free time (both the TV shows and magazine articles show her dancing).
There of course has been debate over whether she was real or not. She very well could have been a regular sized woman who stuffed her bra a few times for a brief flash of fame. However, in several of the magazine photos, she's showing quite a bit of cleavage, so she was clearly well-endowed to begin with. On the other hand, no pictures of her in a swimsuit or other scanty outfits have been seen.
In 2000 I heard from a guy who reported meeting her in 1993 at the Umeda train station in Osaka. I also heard from a guy on another discussion board, who claimed to have seen her in person at a club in Osaka, before she had started appearing on TV. A caption in one of the magazine photos calls her "very famous at Kyoto discos," so it appears that at the very least, an extremely well-endowed woman was in fact seen regularly in Kyoto discos around 1994. Did she pose for TV and magazines to earn money for a breast reduction? The earnings from her few appearences most likely wouldn't have been enough.
Finally, there's a rumor that she was in a photo album, entitled "Chou-bodikon bondeji fasshon" (published by the Tsukasa Shobou company, and photographed by Aoyama Ryuunosuke). However this book came out in May of 1993, well before Arisa's sudden rise to fame, so I suspect that the subject of this book was someone else whose named just happened to be Saotome Arisa, otherwise scans from the book would have appeared by now.
As you can see, I've spent a lot of time and effort researching this topic. Saotome Arisa is one of those mysteries, like the TW Girl, that will continue to intrigue breast lovers for years.