The Sailor Guardians realize Chibiusa is Black Moon's true target. Asanuma, an underclassman of Makoto, overhears a curious conversation between Usagi, Mamoru, and Luna. The oldest of the Spectre Sisters, 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 Usagi managing to defeat Petz, Makoto is caught by her own thunder and captured by Rubeus.