You're the second born child of Queen Serenity, the little sister of Princess Serenity, and the princess of the Moon Kingdom. You fell deeply in love with the prince of Earth, Prince Endymion until Queen Metalia brainwashed everyone on earth to attack the Moon Kingdom, and you, your sister, and Endymion died. Queen Serenity used the power of the Silver Crystal to reincarnate you and everyone else in earth to live peace....

In the present....

You're 13, a year younger than Usagi, and you were downstairs, eating your breakfast as Usagi runs downstairs, crashing and bumping into things.

Usagi: Oh no, I'm late! I'm late! I'm late!

She screams as she ran to get her lunch.

(This takes place all the way back. Timeline is when you meet Luna, Mamoru Chiba, and you and Usagi are the first Sailor Guardians before meeting Ami, Rei, Matoko, and Minako. You both don't know your pasts yet and you also meet Tuxedo Mask)