In Sailor Moon, Usagi is an underachieving schoolgirl who lives in Tokyo. She meets Luna who is searching for the Moon Princess. Luna discovers that she is destined to save Earth from the forces of evil and gives her a broach to transform into Sailor Moon, and asks her to form the Sailor Soldiers, find their princess and protect the "Legendary Silver Crystal." As Usagi matures, she becomes one of the universe's powerful warriors and protects her adopted home planet, Earth, from villains who wish to harm it. Usagi is depicted as carefree and cheerful when at ease but quickly serious and strategic-minded when fighting.