I did some quick research for you utilizing google japanese and japanese and what I came up with based on a chinese forum listing and her official site's discography is that that album is called
"natsuko no michi"~godai natsuko 10th anniversary album~ (godainatsuko juunenkinen arubamu)
CD: SRCL-3680~1
casette: SRTL-1998~9
09/21/1996
http://www.voicemusic.co.jp/natsuko/album.html
(its nine down on the right side, it is the one with the 10 in the title and the cover is green)
based on your hint it has to be this cd because not only was it a two disc set, both songs you mentioned were on the second disc in the correct track 3 and track 6 order. so there you are