Kakashi Hatake sighed as he trudged along the dark night streets of Konohagakure with his Icha Icha Book in hand, to the Hokage's office. He was paying less attention to the book and contemplating more why the Hokage had summoned him at one in the morning. It must've been really important or he never would've called him in this early. He kept thinking this as he put his book in his Flak Vest and walked up the steps and into the Hokage's mansion. He walked down the hall and into the office. The Third Hokage stood up professionally, carrying a small stack of files. Kakashi cocked his head. Between the files, the professionalism, the time and the serious vibe of the room, he couldn't put any of this together. The Hokage ignored his confused glance and dropped the files into his arms, making a motion to open them. Kakashi flipped the file open. Inside were files for a leaf shinobi, and in the picture was a girl who looked a lot like Sasuke.

"Um," was all he could muster. The Third sighed.

"That, Kakashi Hatake, is Sasuke Uchiha's twin," he explained. Kakashi looked up, not believing him one bit. "You don't believe me? Look at the similarities. Read the file." Kakashi looked back down at the file.

Name: Rei Uchiha

Current Rank: Genin

Birthdate: July 23

Age: 12

Gender: Female

Blood Type: AB

Affiliation: Uchiha Clan, Konohagakure

Team: Team 3

Occupation: Shinobi

Family: Fugaku Uchiha (Father), Mikoto Uchiha (Mother), Itachi Uchiha (Older Brother), Sasuke Uchiha (Twin Brother)

Nature Type: Fire, Lightning, Blaze

Kakashi looked back up.

"Is this some kind of joke?" he asked. The Third shook his head.

"She graduated before Sasuke, and was sent on a mission from which she did not return. She was exiled from the clan at a very young age for being born with an unidentified curse mark. She was sent to a now extinct clan, dubbed the Shimarisu Clan by our sources, and Sasuke never knew about her. I want your team to track her mission in Getsugakure and find her. Be subtle when revealing to Sasuke exactly who it is that he's searching for. In short, it's like you're searching for Sasuke, only in a dress… and heels," The Third said. Kakashi stared at him, this time for the dress and heels remark. He turned slowly and walked to the bridge where he usually met his team. He sat there for hours reading the files, and when Sasuke, Sakura and Naruto showed up, they were shocked that he was on time—let alone early. They observed him as he read the file.

"Wow, this must be an important mission. For once, Kakashi-sensei is on time!" Naruto remarked. Normally, Sakura would've decked him for being rude, but instead she just stared at Kakashi.

"You're right. Kakashi-sensei, why are you early and what are you reading?" she asked. He looked up as if he hadn't even noticed they were there until then.

"Oh, hi!" he said feigning happiness. In truth, he was scared to death of what Sasuke was going to do. Sasuke, as if on cue, glared, sensing that something was wrong.

"What's the mission?" he asked. Kakashi laughed nervously.

"Uh, we're searching for someone!" he said.

"Explain," Sasuke demanded.

"Um, uh." He had to tell the truth. "Oh, fine. I can't lie forever. Uh, we're searching for a team that went on a mission four years ago and didn't return."

"Didn't they think to search when they went missing?" Sakura asked. Sasuke ignored her.

"Well, Kakashi-sensei, we can't find them if you don't tell us who they are and what they look like. Give us details," Naruto said.

"Um, well, one is, um, Jein Arei, a brown-haired girl, with purple eyes, last seen in a purple shirt and grey pants. Um, she's a master of Ice Jutsus. The second one is Kouba Ibuka, who looks like that Haku kid we fought, and wears a mask similar in style, and is a master of poison and plant Jutsus. The third? Oh, crap." Sasuke glared. What was so important about the third?

"Well?" he urged. Kakashi laughed nervously again.

"Uh, um, she… oh, okay… her name is Rei Uchiha. She, um, she's a master of… well, every Jutsu Sasuke's a master of, has black hair like Sasuke, looks like Sasuke and just ironically happens to be Sasuke's twin sister," Kakashi said quickly. All was silent until…

"What?" Sasuke asked. "My what? Did you say sister? Rei Uchiha? I don't have a sister, I never had a sister, how can she be my sister?" Kakashi was worried. He'd never seen Sasuke so eager for answers.

"Well, she was exiled from your clan when she was born because she had an unidentified mark on her shoulder. They feared her and sent her to the now extinct Shimarisu clan. She was in a different class and has been missing for 4 years," he said.

"Well, then what are we waiting for? Let's go," Sasuke said sternly.