Prologue

Seto Kaiba had roamed the streets for hours. He loathed his adopted father. Seto may have only been ten at the time, but his maturity reached far beyond that. He decided he'd go buy some cards. When he was duelling, all his cares disappeared. He walked to a little known game shop and bought two booster packs. On his way home, he checked through the cards. All average cards, except one. It was glowing a dark crimson. It was a polymerised card. Silver Fang and Serpent Knight Dragon. It was strange, as it depicted a girl with Silver Fang's ears, tail and two of the sharpest teeth. Also, it she had Serpent Knight Dragon's wings and attitude. She had long crimson hair, tied up in a ponytail with a ribbon. She had cold, ice blue eyes, with a hint of mischief. She wore baggy pants, a tight long sleeved shirt and a cloak. In her hands were two katanas with the millennium symbol imprinted on the handles. She also owned a dagger with the very same symbol. He walked up the driveway and saw numerous cars. His 'father' was hosting a company meeting. He dragged himself up to his room and flopped on his bed. Mokuba ran in and blinked.

"What's that glowing card?"

"It's a weird card. It's called Shadow Dragon Warrior."

Mokuba walked over and looked at the card.

"It's pretty."

"I know. I can't wait to try it out."

Seto walked to a duelling arena and versed a computer. When he placed the new card on the field, he was amazed at the detail. She looked around, shocked that she was free. Unfortunately, she still had to follow orders. She destroyed the computer's monster. The duel was over. Seto took his deck and walked to Mokuba. Mokuba was still staring at the arena. Seto turned around and blinked. The warrior was standing there, just as confused as they were. Seto walked up to the arena and looked at her. She wasn't even ten in looks.

"Who are you?"

She pointed to his deck. He looked at her card. The picture was gone. She sheathed her swords and tilted her head.

"I am also called Kael, master."

"Master…?"

"You have awaken me."

"Go fetch father Mokuba."

Kael blinked and sat down, her wings fusing with her back. She scratched an ear and swished her tail impatiently. Kaiba walked with Mokuba. He walked up to the arena.

"You better have a good reason or you're getting a… what's that?"

Kael stared at Kaiba and hid behind Seto.

"This, father, is Kael. She is a duel monster."

Kael glared at Seto for calling her a monster.

"You can't be serious?"

Seto handed him her card. Kaiba smiled and handed it back.

"She looks almost human. Maybe we can pass her for your new sister."

She curled up in between Seto's legs and fell asleep. Seto looked down and sighed.

"She seems to like you Seto. She will be your responsibility."

Seto nodded as Kaiba picked her up and took her to a spare room. Kaiba registered her as his daughter. She was also enrolled at Seto's school. One of the maids came to wake up Kael and smiled. ~She's so cute and innocent~ The maid bathed her and dressed her. Kael went to grab her swords, but the maid scolded her. Kael blinked and ran out of the room, looking for Seto.

"Master, where are you?"

Seto rubbed his eyes and walked out of his room, only to be practically tackled by Kael. Seto got up and helped Kael up.

"What's wrong?"

"Evil lady said I can't have swords at school."

"She's right. It's not safe."

"Ok master."

Kael pouted and looked away. She had expected him to be on her side.

"You've got to stop calling me that. Call me Seto or brother."

She nodded and he led her to the dining room. They ate breakfast and left for school. She looked around and shivered.

"Don't worry Kael, Mokuba will be with you."

"But you won't?"

"No. I'm in another class."

Kael looked at Mokuba and hid behind him. Seto and Mokuba laughed to themselves. Mokuba led Kael to the classroom and sat next to her. She looked at the other kids. They were staring at her.