Sega Saturn
While the Saturn's success abroad was severely stunted by the marketing policies of Sega of America (and probably also the growing cultural difference in gaming preferences between Japan and the West), the Saturn was very popular in Japan. Created to focus on being a 2D gaming powerhouse, the Sega Saturn had many outstanding games...many of which were not released outside of Japan.
Assault Suits Leynos 2
Chou Aniki: Kyukyoku Muteki Ginga Saikyo Otoko
Langrisser I & II
Langrisser III
Langrisser IV
Langrisser V
Langrisser Tribute