From Wikipedia:
Kingdom of Paradise is an action role-playing video game available for the PlayStation Portable handheld system. The game is called Tenchi no Mon (天地の門) in Japan and Key of Heaven in Europe. On April 24, 2008 it was released as a downloadable title from the North American PlayStation Store.[1] A prequel is available in Japan, Korea, and China called Tenchi no Mon 2: Busōden.
Heavily influenced by Asian culture in general, and Chinese Wuxia fantasy in particular, the game contains clans named after the Ssu Ling. The fifth clan is named Kirin and is not part of the group.