Pretty Soldier Sailor Moon, later retitled Pretty Guardian Sailor Moon (美少女戦士セーラームーン, Bishōjo Senshi Sērā Mūn?), is a Japanese shōjo manga series written and illustrated by Naoko Takeuchi. It was originally serialized in Nakayoshi from 1991 to 1997; the 52 individual chapters were published in 18 tankōbon volumes. The series follows the adventures of the young protagonist Usagi Tsukino as she transforms into the titular character to search for a princess and an artifact of unlimited power called the "Legendary Silver Crystal" (「幻の銀水晶」, Maboroshi no Ginzuishō?, lit. "Phantom Silver Crystal"). During her journey, she leads a diverse group of comrades, the Sailor Soldiers (セーラー戦士, Sērā Senshi?)—Sailor Guardians in later editions—as they battle against villains to prevent the theft of the Silver Crystal and the destruction of the solar system. The manga has been adapted into an anime series titled Sailor Moon which was produced...