One thing that I’ve been researching lately is the link between STS Tech Service and Silverstar Japan/Magnolia. I’ve found some listings for different computer games and PS2 games

https://translate.google.com/translate?hl=en&sl=ja&u=http://tk-nz.game.coocan.jp/gamedatabase/software/DB_SNC2_PS22005.html&prev=search

https://translate.google.com/translate?hl=en&sl=ja&u=https://nlab.itmedia.co.jp/games/gsnews/0202/04/news06.html&prev=search