The games:
Nobunaga no Yabô Online (Nobunaga's Ambition Online)
, Daikôkai Jidai Online (Uncharted Waters Online)
, Shin Sangoku Musou Online (Dynasty Warriors Online)
and Mikunishi Online.
No idea how big the games are but I really want that Dynasty Warriors online game.
Source
http://www.gamefront.de/