The Black Moon Clan, led by the scheming Prince Dimande and the mysterious Wiseman, are plotting to exterminate the Sailor Guardians of the future by altering the past. Chibi-Usa, the brash pink-haired girl who fell from the sky, is at the center of this multi-generational space-time rift. With the help of the stoic Guardian of Time, Sailor Pluto, can Sailor Moon restore order before the future Crystal Tokyo is forever destroyed?