During a solar eclipse, a mysterious floating circus tent appears in the sky over Tokyo. Meanwhile, Rini is fascinated by a Pegasus who appears to her in a dream.
When Rita returns from Africa, Serena becomes concerned that she and Andrew are having relationship problems. Meanwhile, Tiger's Eye selects Rita as a target.
Serena and the Sailor Scouts are shocked to find out that Mina is dating two boys at the same time, but little does anymore realize that her suitors are Tiger's Eye and Hawk's Eye.
Serena and Rini are befriended by a mysterious foreign woman who accompanies them to the Azabu-Juuban summer festival. Unbeknownst to them, their acquaintance is a visiting princess who is being pursed by both her government and Hawk's Eye.
While Fisheye targets Darien, Queen Nehellenia appears before the Amazon Trio and warns them that without the Golden Crystal, they will soon revert to their animal forms.
Fisheye discovers Rini communicating with Pegasus, but refuses to cooperate with Zirconia's plans. As Hawk's Eye pursues Serena for her Dream Mirror, Zirconia decides that the Amazon Trio have outlived their usefulness.
Amy becomes obsessed with a tune she found on the internet, and writes lyrics to it. Meanwhile, VesVes of the Amazoness Quartet targets the tune's composer.
On the eve of his school's athletic meet, Kelly worries about the box horse, the one obstacle he is unable to clear. JunJun approaches him with the intention of taking his Dream Mirror, and offers to be his coach.
PallaPalla's magic causes Serena and Rini to switch ages, turning Serena into a child and Rini into a teenager. While Rini is thrilled with her new body, she is distressed to discover that she can no longer call Pegasus.
As Rini becomes even more enamoured of Helios, Serena and her Sailor Scouts realise that she is in love, and are determined to discover the identity of her crush.
The Golden Crystal's power defeats Nehelenia, pushing her back into the abyss where she was originally sealed in. Refusing to go alone, Nehelenia tries to take Sailor Chibi Moon with her.