It's worth pointing out that there are two versions of the game; a two CD version and a DVD version released later. The DVD version is a little different. There is a walkthrough for it here:
http://www5e.biglobe.ne.jp/~mirai-m/kiminozodvd.htm
and another for both versions here:
http://www.geocities.co.jp/HeartLand.../kiminozo.html
The top one was previously mentioned in an earlier thread by LiCe.
Frank