The Apprentice Of The Radio Demon

In 1989, (Y/n) was in the seventh grade when her Best friend's death changed her life. Sure they had a good life together, always defending each other from (Y/n)'s sister and her lackeys. The only three people she ever cared about were her mother, brother, and friend. Soon tragedy struck when her dear friend died from poison. (Y/n)'s life became a living hell. Her father never acknowledged her pain, her sister would always bully her, and no one believed her. She finally had enough when she ran into the forest that was close to her school, but what she didn't know that with her rage she accidentally summons a demon. This demon makes a deal with her; he will assist her to fulfill her revenge to those who wronged her and in return she must give him something. No, it's not her soul he wants, he wants her to become his apprentice.