K: Project Eden

Four years after the defeat of the Green king, the garden of Eden, the eternal garden begins to fall down from the heavens. Akari, the guardian and king of the eternal paradise, along with her two knights, Mikoto and Tatara, descend down to the earth in the little city of Shizume. There, they seek help from the kings of color clans to help them try to put Eden back up into it's place before a total oblivion of the world occurs.

Although the kings agree to help, there are matters being dealt with the Gold, Colorless, and Green kings who's positions are unoccupied at the moment and the Dresden Slate seem isn't choosing another king for their clans. But, if the Gold, Green, and Colorless positions remain unoccupied, then Eden will surly fall down into the Earth, thus destroying the world.