Luna becomes suspicious of the new girl in school, Ami Mizuno. Usagi also joins in on the suspicion when they find a brain-washing program on a disk Ami leaves behind as she rushes to cram school. Usagi enters the school by disguising herself as a doctor with the Luna Pen. After transforming into Sailor Moon, Usagi realizes the cram school teacher is the monster, not Ami. The monster tries to steal Ami's energy, but a symbol appears on her forehead. Luna realizes that Ami is one of the missing Sailor Warriors. Ami transforms into Sailor Mercury using a pen Luna gives her. Sailor Mercury and Sailor Moon save the day by defeating the monster and freeing the possessed students.
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