"Legend of the Five Rings (often abbreviated L5R) is a fictional setting created by the Alderac Entertainment Group in 1995. The setting primarily involves the fictional country of Rokugan, though some additional areas and cultures have been discussed. Rokugan is based roughly on feudal Japan with influences from other East Asian cultures. This setting is the basis for the Legend of the Five Rings Collectible Card Game as well as the Legend of the Five Rings Role-Playing Game. Legend of the Five Rings was also the "featured campaign setting" of the Oriental Adventures expansion to the third edition of Dungeons & Dragons, though this book is now out of print.
The deep, evolving story of Legend of the Five Rings is one of the features that sets it apart from most game settings. Players of the collectible card game, and to a lesser extent the role-playing game, can influence this story as it progresses by participating in sanctioned tournaments. The winners of major tournaments make pivotal decisions that can influence the storyline for years to come, with winners of minor tournaments influencing the storyline in lesser ways.
Legend of the Five Rings has broken new ground in player interaction in hobby gaming with the Race for the Throne. This mega-event took place over 2007 and 2008, where players of both the collectible card game and the role-playing game could affect the storyline of their Clan by earning points in various Spheres of influence."
Source: Wikipedia, "Legend_of_the_Five_Rings", available under the CC-BY-SA License.