Kuroshitsuji: The soul of light

The story is about Aiko Shizukana the head of the Shizukana household, at the age of 15 she lost both her parents who've been murdered right in front of her. When a bullet hits her chest and she dies she accidentally summons a demon named: Sebastian Michaelis.
She vows revenge for the one who killed her parents and makes a contract with him.
He is her butler and he gets her soul, that's fair right? She has some adventures with Sebastian, but in the end she will only lose her soul to him.

Disclaimer: I do not own any of the Kuroshitsuji characters, all rights go to: Yana Toboso, Square Enix and Yen Press.