I have tested your saves on the latest version 1.0c and had no issues what so ever. this tells me the problem is isolated to your setup. I suggest ensuring you are using a locale emulator or better yet change your locale settings on your computer to have japanese as a alternative locale. A quick search of google can help you in doing that.
If that fails to work, try moving your game to your C:/ drive if it isn't already on the C:/ and test again. If that does nothing, then I would say try redownloading the game image fresh from the links in the OP and attempt to test again with your saves.
I just updated the OP with the latest version (and the same version I tested on.) You can always redownload that copy and see if that works.
Also on a side note
Bolt237
Fixed a small error with a missed \ on one of Lisa's text lines in map 104. Feel free to apply this file to your next patch