Mamoru experiences a brief flash of Chibiusa's memories upon approaching her, showing the image of an explosion. Meanwhile, Asanuma, an underclassman of Makoto's overhears a curious conversation between Usagi, Mamoru, and Luna.
The third and oldest of the Spectre Sister, Petz, spreads a virus across the city and sends an army of Droids to replace everyone in their weakness. As Makoto is weakened by the virus, Asanuma looks after her, and learns her true identity as Sailor Jupiter.
Despite Sailor Moon managing to defeat Petz, Sailor Jupiter is caught by Petz's thunder abilities and captured by Rubeus just as Sailor Mars and Sailor Mercury before her.