In Crystal Tokyo, at the Crystal Palace, Chibiusa is sound asleep. She has a very pleasant dream. On the back of a Pegasus, she and Helios discuss many things. She even blushed at times. Suddenly, Helios hears a weak voice.

"Did you hear that?" He asks Chibiusa.

Although it is only a dream, Helios sounds so real.

"Yes. It sounds like a girl's voice."

"Let's try to find it, shall we?"

Chibiusa nods. Why not? It's like going on an adventure! But I would have preferred to spend more time alone with him. Helios and she look for the voice's location.

"Look!" Chibiusa said suddenly.

She points to a child's silhouette. She seems to be taller than Chibiusa. As the Pegasus approaches her, it disappears without warning. Chibiusa calls to Helios for help as she falls quickly to the ground. He doesn't answer her. He isn't there anymore.

"NOOOOOOOO!" She shouts while closing her eyes.

Chibiusa seems to lose consciousness. When she comes to, she is still in her dream. The face of a girl with brown hair and green eyes is leaning towards her.

"Are you okay?" The girl asks Chibiusa.

"Y...Yes. I think so. Who are you?"

"My name is Sakura, Sakura Kinomoto. And you?"

"I am Usagi Small Lady Serenity."

"Huh?" Said Sakura, surprised by Chibiusa's full name.

"All my friends call me Chibiusa. Chibiusa Tsukino."

"I see! You must be wondering why I am here in your dream."

"Yes and no. I must have imagined you."

"No. I'm real, like you. I... I don't know how to explain it to you..."

"Explain what?" Chibiusa asks, curious.

"I come from a different world than you. I'm a Cardcaptor."

"A Cardcaptor?"

"Yes. I released the Clow Cards and I had to capture them again. I managed to do that, but..."

"But?"

"But some of them have become wandering cards again, without a magician to control them." Sakura explains. "Kero doesn't understand how this could happen. I wrote my name on each of them, so they should have stayed with me."

"I don't understand..."

"Chibiusa, you have to recapture them for me!"

"Whaaaaat?!"

"Please! I have to get them back. Kero told me that the Final Judgment is almost here and, without all the cards, something terrible is going to happen."

"Something terrible? Like what, your world's end?"

"I don't know. Chibiusa, you're the only person I managed to reach in a dream. You are the only one who can help me."

"But, I... how can I capture these cards? I'm a Sailor Guardian. I have powers, but..."

"You need this."

Sakura takes out a small key that she wears around her neck like a necklace and she gives it to Chibiusa. She explains that this key is magical. The key can turn into a large magic wand that can seal (capture) the Clow Cards. Normally, only Sakura, chosen by Kero, can use it. Since this is an exceptional situation, Kero showed Sakura how to transfer her Cardcaptor status temporarily to someone else.

"So I'm going to make you a Cardcaptor, like me. Then you can capture the elusive cards."

"That's great!" Chibiusa exclaims. "How many cards do I have to recapture?"

"Seven. Windy, Wood, Watery, Firey, Earthy, Light and Dark."

"All right."

Then, Chibiusa asks Sakura her age. Just out of curiosity. Sakura is 11 years old. Chibiusa, in appearance, is only 7. In reality, she is more than 900 years old, but she won't tell Sakura that. Then Sakura performs the transfer ritual. To do this, she must hold Chibiusa's hand as she holds her magic key, and then utter the following incantation: "O key of the seal. O key that hides the powers of darkness. I, Sakura Kimonoto, offer my burden and my duty to this girl, Usagi Small Lady Serenity. Grant her your power, O key! RELEASE!" A great light dazzles Chibiusa and the key in her hand turns into a long pink wand with a bird's head with pink stones as eyes, a red beak and a pair of small white wings on the back of the head. Chibiusa is so surprised that she almost drops the wand on the ground. Fortunately, Sakura is there to help her catch it.

"Thank you." Chibiusa said to her. "I will do my best to recapture the cards."

"Yes, I'm counting on you. You will wake up soon. I have to explain the incantations to you to—"

"Small Lady? SMALL LADY!" Suddenly says another voice.

This wakes Chibiusa up with a start. Her mother, Neo-Queen Serenity, looks at her with concern.

"Mom?" Chibiusa questions. "I'm fine. Why did you wake me up?"

Her mother, the queen, explains that she felt an evil presence around her.

"Huh? An evil presence? That's impossible."

Chibiusa thinks back to her dream. Sakura isn't an evil person. Her magic key... Of course. The key's powers come from darkness, but all it can do is capture (and probably use) the Clow Cards. Nothing dangerous.

Chibiusa tries to explain everything to her mother, but Neo-Queen Serenity doesn't want to hear anything. Wanting to protect her daughter, she orders her to give her Sakura's key.

"NO! Mom, after all we've been through together, in the past, you still don't listen to me, don't trust me?!"

It's true that, for some time, the queen and her daughter have been arguing often. Sometimes on trivial matters, but other times on more serious matters.

"Sakura is not an enemy! I'm going to recapture the Clow Cards and you're not going to stop me!"

With that, the princess runs out of her room, Neo-Queen Serenity at her heels.

"Wait. Small Lady, wait!"

Chibiusa ignores her and then the queen says something surprising.

"Go back in time."

Chibiusa, surprised, stops running. She turns around to face her mother.

"The Clow Cards are in the past. In the twentieth century."

"Mom?"

"Forgive me, my daughter. I... I always... have a kind of distrust... towards darkness. Go find Sailor Pluto. Ask her for a time key and—"

The queen is interrupted by her daughter who runs to her and throws herself into her arms.

"Oh Mom! THANK YOU!"

Mother and daughter embrace for a while, then Chibiusa leaves her to get dressed and go find Sailor Pluto. Since her return to the future, Chibiusa has given her time key to Pluto, not thinking of having to go back in time again. In the end, her adventures in the past are not over.

Sailor Pluto is happy to see the young princess again.

"So, you have to go back to the past?"

"Yes, Puu. Can I have a time key?"

Pluto promptly gives her one. Chibiusa thanks her and she returns to the past.