Princess Serenity lived in the Moon Kingdom during the Silver Millennium as the daughter of Queen Serenity, who ruled the Silver Millennium and watched over the Earth. She is the preincarnation of Usagi Tsukino (Sailor Moon). Her guardians and closest friends were Sailor Mercury, Sailor Mars, Sailor Jupiter, and Sailor Venus, who were princesses of their own respective planets, but lived on the moon with her at times. This is the original depiction of the character created by Naoko Takeuchi.