Sailor Moon and the Sailor Guardians are about to face their greatest challenge yet-high school! But as the girls take their next big step in life and Chibi-Usa prepares to return to the future, a mysterious force frees the evil Queen Nehalennia! While the struggle to contain her old enemy will be difficult, it may be Mamoru's year of studying abroad that hurts Usagi the most. But there's even more to take Usagi's mind off of long distance love with the arrival of the villainous Sailor Anima Mates and the heroic Sailor Star Lights! Who could be behind this new wave of evil? And why are the Star Lights resistant to working with Sailor Moon? Usagi has her hands full, but she'll always make time to write a love letter to her beloved Mamo.

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 the fearsome Dead Moon Circus led by the villainous Zirconia arrive in town to draw out Pegasus by targeting people with beautiful dreams! Sailor Moon and the Guardians must unite to fight a new enemy and her deadly henchmen, the Amazon Trio. But without the power to transform into Super Sailor Moon, the Guardians find themselves seriously outmatched! Will Sailor Chibi Moon's strong desire to protect everyone's be the key to accessing Pegasus's power?

Usagi's friend Rei has been plagued by disturbing visions of the Apocalypse just as a new enemy appears in the city. The maniacal Professor Tomoe, leader of the Death Busters, has been targeting innocent citizens in a search for three special pure heart crystals. Usagi is prepared to confront this dangerous new foe, but two powerful new Sailor Guardians are already seeking the crystals and have no interest in working with Sailor Moon and the other Guardians. Where did they come from, and what is their plan for the talismans?