The game takes place in the distant future within a parallel dimension known as the Cosmic Ark. A race of gigantic robots, called Arks, which had lain dormant for a long time, suddenly awakens to discover that their galaxy is ruled by the evil Chaos. Because they remained dormant for aeons, the three remaining great Arks—Wisdom, Courage, and Strength—have been drained of their energy. Consequently, there is only enough energy left to revive one of them with the power to vanquish the evil Chaos. To achieve this, three different Unions of followers, each dedicated to one of the great Arks, have formed. They compete for the revival of their respective Ark, and thereby for the defeat of Chaos and the fate of the world. In addition to this overarching story, the game features several character backstories. These include, for example, the background of Crimrose and Ivis, the story of Eihwaz, or the meeting between Eris and Resha, among others.