I scanned this image from local sex story book cover that I bought about years ago. Unfortunately, the book contents doesn't mention any of her. The book just used her image without permission I guess.
Ok, it seems I finally found her identity. Today, I made a fortunate experiment: using an image editor, I lowered the red color tone and increase the brightness of the image above, then I uploaded to the google image and I found some links, one of them is this: http://www.18ok.com/Chiasa/page_02.htm
That link shows Chiasa Aonuma (青沼ちあさ) pics album, so I guess that's her (although I still have a bit doubt).
Anyone here really think that she is Chiasa Aonuma?