Disclaimer: Don't nor ever will own the Sailor Moon characters. I know your're groaning there in front of your little computer screens. :)
Prologue
Over a thousand years ago, our moon was home of a large, prosperous empire which spanned the entire universe, with the exception of a few planets, namely Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. All those planets, with the exception of Earth, had one royal family. Even the Sun, then called Solaria, had a royal family. What about the Earth, you say? Well, their system of government was much like ours today here in the US. Each hemisphere had a noble family, who all reported to the royal family of Earth. Simple as pie, right? Wrong. For you see, the king at that point in time was very corrupt. He even ignored his lords plea to feed his own subjects.
One of the more famous lords would be Lord Jadeite of Fire. Like many young nobles, his marriage to the Duchess Katrine of Russia was arranged upon her birth. So at 18, he married Katrine. At this time, many attacks had befallen Earth for the Sun King's sister, Beryl, had established herself as Queen of an evil dimension appropriately named the Dark Kingdom. Unfortunately, she was now able to tap into the power of a very evil and equally powerful creature named Metallia. She was now capable of capturing and brainwashing any creature, dead or alive.
However, there was a joyous time - the birth of Lady Cera, Jadeite and Katrine's beautiful daughter. Sadly though, Katrine died three years later of unknown reasons. Soon afterwards, all the Terran Lady Sailors, the Sailor of the Sun (also it's princess) and Cera betrayed their kingdoms and joined the side of the evil Beryl. However, they realized what Beryl was going to do and they returned home, never to be trusted by their people again.
Meanwhile on the moon named Silver Millennium, the populous had great reason to rejoice. Their princess, Serenity, had a very important birthday drawing near. It was to be the most important birthday a royal could have. Unfourtunantly, Beryl captured all the Terran lords and turned them against Silver Millennium, then she crashed the party and the Silver Millennium fell to the invaders, was destroyed, and totally erased from history. Surprisingly though, Queen Serenity, Silver Millennium's queen, had the last word. She sent all the Moon Children and the royalty to the 20th century on Earth to live peacefully. The only ones left behind were 10 innocent citizens of the decimated Kingdom. Also left were the Terran Lady Sailors, the Solar princess, and Cera, who had tried to use their powers to stop the destruction, but to no avail. They had be en condemned to live the rest of their immortal lives in the immense grief that came from having one's home destroyed. You could say that it was fitting punishment for their crime.
As for the other planets, after Silver Millennium's downfall, they each, with the exception of Earth, were decimated and left uninhabitable. Solaria simply shut itself away, also never to be heard from again. Everyone who knows the legend of the Kingdom of the Moon has tried for millennia to find out when the Royal Court of the Moon will be reborn. Only the devastated survivors know when the Silver Millennium will rise to claim it's lost glory again. And they hope that when it does, the horrible Negaverse will never raise it's ugly head to disturb the blissful peace needed for emotional healing, which will take millennia to be complete.
And so, our story begins...