Luna, Usagi's black guardian cat, as well as her and the other Sailor Guardians' adviser, informs the Inner Senshi that they will go to the Moon during the next full Moon.
Shocking the Inners, causing them to question, main Sailor Mars, aka Rei, for she thinks about how they will get there. "Can we even breathe on the Moon when they arrive," she thought to herself.
As Ami, Sailor Mercury, reads a science book about the Moon; Minako, Sailor Venus, assures the girls she knows how to get there, and that everything will be fine.
Of course Usagi is nowhere to be seen by the girls' side, she was too busy watching Naru playing the Sailor V game.
Which is a good thing, since she is finally out of her room and keeping her mind busy after losing Mamoru.
When she is alone in her room, her only thoughts are about how to rescue him from Queen Beryl. She is determined to go to the Moon and learn everything about their past. Hoping she will find a way to save her love.
Usagi's father, her Earth father, comes home from work and brings her the Silver Crystal on a necklace. "Aw such a nice thing to do Dad, he barely even questioned it," she thought, grinning.
She asked him for this favor and he even teased her about her boyfriend giving that crystal to her.
Her parents do see her maturing into a woman, but will always think of her as their spoiled little girl.
They are discussing this as she is fighting with Shingo, her younger brother, over a handheld video game.
Later on, the Inners gather in the park as Luna transforms a fountain into a transporter using the reflection of the Full Moon.
They all transform into their alter-egos and walk on to the Moon's reflection. Together they use their powers to create a shield around them as they teleport into space.
Once they arrive all they see are ruins of the Moon Kingdom and pure silence.
They walked to where the old Prayer Room with the Crystal Towers is still standing. Only the Queen was allowed into this room, since this was the core of the Moon Castle.
The girls noticed that in the middle of the room there was a sword on a pedestal.
Each of the girls tried to pull it out, not even Makoto aka Sailor Jupiter; the strongest one of the group was able to pull it out! Not until Sailor Venus took a shot at it and she was able to pull the sword out.
Suddenly a stern but soft voice calls out. The group realized that this was the Holy Sword to protect the princess.
The sword belongs to Sailor Mercury, Mars, Jupiter and Venus.
The girls then wondered who was the owner of that voice.
The group is stunned to learn that the voice belonged to Queen Serenity, the sole ruler of the Moon Kingdom during the Silver Millennium and Princess Serenity's mother.
Queen Serenity tells the girls about their past lives as they slowly start to remember it. Princess Serenity always tried to sneak away to go visit the Earth, since it was forbidden for her to go there until the peace talks were settled.
But her…BROTHER, Prince Mitsuki, would always alert the Inner Senshi, causing the girls to manage to find her and bring her back to the palace.
"I had a younger brother," muttered Usagi as she continued to listen.
Those who lived on the Moon, and Sun lived long lives, so they can guard the Legendary Silver Crystal and the Legendary Golden Crystal, to watch over the Earth as it grows.
During the last year of the Silver Millennium, an evil creature invaded Earth making everyone on Earth turn evil & have hatred against the Moon Kingdom! It even affected Beryl, Prince Endymion's generals, who were all close allies to him; the betrayal hurt the Earth Prince dearly, but Prince Mitsuki attempted to comfort him, in his own sassy way.
The evil's goal was to gain the power of the Legendary Silver and Golden Crystals, this envy on the powerful crystals created an epic battle, the people of Earth vs Moon Kingdom with Prince Endymion on Moon's side!
But Prince Mitsuki wanted him to be safe, for he knew what he meant to his older sister, so, during the battle, instead of Prince Endymion, Mitsuki gets killed by a woman with her sword as he protected his sister.
As Princess Serenity witnessed his death, she decided to kill herself with the Holy Sword to join him in death! Why?! The omegan Prince saved her so she can live and then she kills herself?!
It was cute and strengthened their sibling bond, in a way… but still.
Knowing her beloved son and daughter died, not being able to win the battle, Queen Serenity sealed the enemy and gave everyone a new life in the future.
She wanted to give her daughter and son another chance in life along with all the other lives that were lost during this battle.
In doing that, the Silver Millennium turned into stone with no life able to live on the Moon again, no heir to take care of the Sun, while Earth restarted with the past history erased. Magic always comes with a price!
As much as Queen Serenity hoped the enemy being sealed would help bring peace again, it escaped…and the only people who can use the Silver and Golden Crystals and defeat the enemy once and for all is Sailor Moon and her brother, who will become Sun Knight.
Usagi heads filled with doubt, will she be strong enough to defeat this evil enemy? And how will she even find her brother?
With the light of the Silver Crystal in Mamoru's body, it cannot be used.
Queen Serenity ensures Sailor Moon that the Silver Crystal depends on her heart & desires. If she desires enough to save not only Mamoru, but to locate her brother, defeat the enemy, the crystals will shine once more.
With Queen Serenity's last words, "be happy and stay true to yourself," she disappears, never to be seen or heard from again.
"I'll find you brother, and together we will defeat this evil," mumbled a determined Usagi, in Japanese.
Usagi in fact, did not locate her brother until the battle was finished. What shocked her even more, looking into this mirror Sailor Pluto gave her, was that he was a mutant turtle!
"What did he get himself into," sighed Usagi, "whelp…time to get my brother, and save the world, again!"