Chibi-Usa/Moon plays a large role in this Sailor Moon series, as the Super S season begins with her dreaming of a beautiful and mysterious winged horse, the Pegasus that becomes her friend. The following day, during a solar eclipse, a magic circus tent descends on the city. The Dead Moon Circus (Zirconia, Nehelenia, the Amazon Trio, the Amazoness Quartet) arrives in town, and emerges as the newest group of villains to threaten the earth! Sailor Moon's battle against them goes badly until the Pegasus gives Chibi-Moon the Super Sailor Chibi-Moon power! Meanwhile, Artemise and Luna are in for a surprise when Diana arrives - their daughter from the future!?
Pegasus sacrifices his freedom and the Golden Crystal to save Mini-Moon's life, but just as everyone begins to fear that Queen Nehelenia has won, the Queen is betrayed! Sailor Moon attempts to use power of the Golden Crystal, but that's not enough. Will Mini-Moon's idea defeat Nehelenia, and even if it does, can Sailor Moon and Mini-Moon avoid being trapped on the darkmoon?