From Japanese Wikipedia:
A Japanese company based in Kumamoto, focusing on the planning, developping and publishing of computer and video games.
They were founded in 1988, and started out with focusing on software for the PC Engine CDROM2 (Turbo-graphx16), but ever since Sony's the release of the Playstation, they have mainly been releasing for the PSX and the PS2.
Among their representative works are Gunparade March, "Over my dead corpse" Linda^3 and Castle Shikigami