Usagi Tsukino is chosen to be a guardian of justice and is sent on a quest to locate a Silver Crystal before the Dark Kingdom invades the Earth.Usagi Tsukino is chosen to be a guardian of justice and is sent on a quest to locate a Silver Crystal before the Dark Kingdom invades the Earth.Usagi Tsukino is chosen to be a guardian of justice and is sent on a quest to locate a Silver Crystal before the Dark Kingdom invades the Earth.