It appears to be a line of Japanese word processors that also plays games. I bought about 6 games for it off of YAJ a few months ago. They were all Mahjong and card games, but it came with Tetris too. I'll post pictures of the boxes when I have a chance, but here's some screenshots from the auction itself:
The games come on 3.5" disks, but I think they're the weird Japanese 2HD or whatever format, so I haven't had any luck getting a PC to read them. Does anybody know anything else about the system?