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Princess Serenity lived in the Moon Kingdom during the age of the Silver Millennium as the daughter of Queen Serenity, who ruled the Silver Millennium and watched over the Earth. Princess Serenity's 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.Princess Serenity often explored Earth to see real greenery, even though forbidden to do so.On one of her visits, she met the crown prince of the Earth, Endymion, and they fell in love.

Source from Wikipeida