Usagi Tsukino is a little clumsy and a crybaby, but she's also one spirited eighth grader. One day she meets Luna, a black cat with a crescent moon mark on her forehead, and transforms into the pretty guardian of love and justice in a sailor suit, Sailor Moon. As a chosen guardian of justice, Usagi apparently has a mission to protect a princess, and to find her fellow guardians and the phantom Silver Crystal.