Tsukino Usagi (in the U.S. she's Serena) was a princess of the moon. Her mother, Queen Serenity, sent her to earth to be safe from Queen Beryl (a person planning to take over the universe). There she was reborn and lived a life of a regular child or whatever. The story "sailormoon" takes place when Usagi is 14 years old. She's a clumsy-immature-ditzy-hungry-girl that is always late for school.She isn't very bright and always gets detention. Anywayz, she becomes sailormoon when Luna (a purple cat sent to watch over her) comes and brings back Usagi's memories of her past life. She transforms into sailormoon in time to save her friend Molly who is getting the energy sucked out of her.

Usagi is in love with Chiba Momoko. (In the U.S. he's Darien). He's a college student with black hair. He is also known as tuxedo mask, a dude that always saves Usagi when she's in trouble. In the future while they are in the moon kingdom, they get married and have a child named Chibi Usa. And that's all I want to summarize. If you find any false info, tell me because I watched Sailormoon a long time ago and forgot most of it.