On her way to school, 14-year-old Usagi Tsukino briefly encounters a cat with a crescent-shaped bald patch on its forehead. Elsewhere, a shadowy figure creates a woman out of clay, tasking it with obtaining a "Legendary Silver Crystal". Meanwhile, after Usagi hears from her friends about the masked vigilante, Sailor V, who recently thwarted a robbery, she and her friend Naru Osaka to visit her mother's jewelry store, which is undergoing a sudden sale for some reason. After briefly bumping into a handsome stranger and getting lectured by her mother for her low test grades, Usagi is once again approached by the cat, who reveals she can speak and introduces herself as Luna. Luna gives Usagi a mysterious broach, allowing her to transform a Sailor Guardian. Upon transforming, Usagi hears a cry for help from Naru, whose mother had been replaced by a youma named Morga who was using the discounted jewelry to drain energy from those who bought them. Calling herself "Sailor Moon," Usagi confronts Morga. However, the youma uses the possessed girls who had bought jewelry from her to attack her, and her cries of anguish turn into ultrasonic waves, rendering the possessed girls unconscious. With encouragement from a masked tuxedo-wearing stranger, Usagi kills Morga using her Moon Tiara Boomerang. As Usagi sees off the stranger, who introduces himself as Tuxedo Mask before flying off, the shadowy figure watches over her actions.