The fifth and last of the Witches 5, Cyprine steals pure hearts from Infinity Academy students, and the Sailor Guardians engage Cyprine, and her alter-ego, Ptilol, in a showdown. Meanwhile, Chibiusa is abducted by the recently resurrected Kaolinite, and her pure heart is stolen by Mistress 9, having taken over Hotaru's body, which allows her to awaken as the Messiah of Silence.