Mayumi Osaka (Crystal)
Naru Osaka (daughter)
Mayumi is the mother of Naru and the owner of the OSA-P jewelry shop.
At the start of the series, Jadeite sends the youma Morga to the human world to rob women of their energy. Morga assumes the form of Mayumi and leaves her bound and gagged in the basement of her shop, but is later destroyed by Sailor Moon. Mayumi is presumably freed after this.
- Mayumi only appears briefly in the first episode, tied up in the basement with her mouth taped shut. Morga spends the majority of the episode posing as her, though Naru and Usagi are initially unaware of this.