Old School Bujin RO
Old Tyme 2000's Codebase Version, running an old school client that may take a little work to get running.
Registration is handled by appending _M or _F to an account name at login, like so;
<youraccountname>_M to have male characters.
<youraccountname>_F to have female characters.
Download: http://ogro.bujingames.com/RO.7z
More Modern, Pre-renewal:
Register: https://ro.bujingames.com
Download: https://files.bujingames.com/BujinRO.7z