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...