Kingdom Hearts: Unchained Chi — online action role-playing game in the roguelike genre. It is a prequel to the Kingdom Hearts series as a whole, taking place several centuries before. This takes place before the Keyblade War, which established the organization of the universe as in the original game. The player assumes the role of a Keyblade wielder who joins one of five factions, led by Keyblade Masters, vying for control of the limited light that exists in the world. Unchained χ / Union χ acts as a sequel, retelling part of the story of Kingdom Hearts χ before diverging and telling a new story set after its events. The plot of the game is related to Kingdom Hearts 3.