A majestic pegasus with a golden horn has appeared in Chibi-Usa's dreams with a request - to help him and keep his presence a secret. This plea turns out to be more than a childish dream, for soon the fearsome Dead Moon Circus arrives in town! Led by the villainous Zirconia and the beautiful Queen Nehalennia, their goal is to draw out Pegasus by targeting people with beautiful dreams! Sailor Moon and the Sailor Guardians must unite to fight powerful new enemies, but these enemies are hiding secrets of their own...