PC-98



This little NEC computer utterly dominated the Japanese computer market (until the advent of IBM PC's, that is), such that even the vastly superior in every way X68000 and FM Towns could not dethrone it. Why? Simply because the PC-98 was flooded not only with doujin games, but mainly with eroge games (read: Hentai). Even so, there are many hidden gems if you search carefully.

There is this nice site dedicated to document the PC-98 games catalog. Go check it out.