This is a little late but Rapapuru released a very large patch that adds a bunch of new scenes and an couple of extra routes (Harem Route). You can download the patch from their website here:
http://www.rapapuru.com/products/10_m3_2/dl.htm
FYI, I was able to get it to work by just changing the Format in the Formats tab to Japanese (Japan). This was on Vista 64-bit.
Is this some kind of regional protection or just a game bug?