Disclaimer: I don't own Vocaloid or Black Butler.
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Yuki ran home from school, she was excited to tell her parents about her day. She was shocked to see police at her house.
"What happened? Where's my mom and dad?" Yuki asked. One officer looked at her as she began to cry in fear.
"Little girl, I'm sorry to say this, but a "bad person" came to your house and "hurt" your mommy and daddy, and the pain made them leave and go to Heaven." The officer said in the best way to explain murder to a little girl. Yuki burst into tears at the realization her parents had died.
Several months later...
Yuki had moved in with a group of friends down the street from her house. She was happy and accpeted the fact that her parents were in a better place, but her friends kept saying that the killer deserved to die, and every single one of them always got at the fact that the killer was never caught and the case went cold.
Yuki was left by herself for a few days. She was on the internet reading about ways to find the killer herself, she just wanted them to be happy. That's when she found a website that said she could summon a demon to do it for her.
Yuki immeadtly got all the stuff she needed to summon a demon and turned off all the lights. Yuki chanted the spell she read on the internet and sat in silence for several moments.
"I should've known it was fake..." Yuki said. It was then she noticed there was a slight breeze, even though she was indoors and all the windows and doors were locked. After it died down, she noticed the feeling of someone's presence.
Yuki turned around to see a boy, he appeared to be only a few years older then her. Next to him who was much taller then both of them. Yuki jumped up and down in excitement.
"Yay! It worked! It worked!" Yuki said. The younger looking one sighed.
"Sebastian, a child has summoned me." He said. The older one (apparently named Sebastian), put a smile on.
"Young master, it's not like this is the first time a child has summoned a demon." Sebastian said.
"Well, which one of you is going to make the deal with me?" Yuki asked.
"I am. Tell me your wish." Said the younger demon.
"I wish for you to track down the man who killed my family and kill him! So my friends can finally be happy!" Yuki said.
"Alright. Where should your contract seal be?" The younger demon asked.
"On my forehead! My hair will cover it up!" Yuki said.
"Until the I find the person who killed your parents, I, Ciel Phantomhive, will serve you until the end."