"The threat of Dead Moon Circus is so great that the outer planet Guardians return to fight alongside their compatriots. But with Usagi now coughing up black blood as well, are they too late? And to make things worse, Queen Nehelenia's servant Zirconia casts another curse upon Usagi and Mamoru, sending them both back into childhood. However, Helios whisks away their spirits to Elysion, where they manage to break free and return to their true forms....

"Chibi Usa's sickly friend Hotaru isn't just Sailor Saturn, Deity of Destruction. She's also possessed by Master Pharaoh 90. Facing this cataclysmic power will be impossible-- unless Sailor Moon can unite the powers of every Guardian of the Solar System. Then, when the moon eclipses the sun, a mystical unicorn begs for help. An elaborate ship floats through the sky, and Usagi and Chibi-Usa have trouble seeing eye to eye" -- from Random House web site....