Usagi Tsukino , better known as Sailor Moon , is a fictional superheroine who is the main protagonist and title character of the Sailor Moon manga series written by Naoko Takeuchi. She is introduced in chapter #1, "Usagi – Sailor Moon", as a carefree schoolgirl who can transform into Sailor Moon, the de facto leader of the Sailor Soldiers. Initially believing herself to be an ordinary girl, she is later revealed to be the reincarnated form of the Princess of the Moon Kingdom, and she subsequently discovers her original name, Princess Serenity .
