GREE supports any software app that supports TOTP tokens.
It appears there is no information about this service provided
online though it is readily accessible in the "My Profile"
section of the management console.
Go to the Two Factor Auth management page
At the top of the page, click "Enable" under
"Two Factor Auth"
Follow the wizard to configure your Two Factor
The next time you log in to the GREE website or app it will
prompt you for your token