Meet Misty, a girl who has been bullied for quite a while, and makes an attempt at summoning an angel… only to mess up halfway through, and unleashes a demon by the name of Melody. Straight to her. Despite this, Misty still decides to compromise with Melody on a simple agreement. And one steep price.
Melody is in charge of protecting Misty.
In exchange for her soul.
Hope it was ok :p