the girl who became a magical spy(changing name later)

Kasai was a lonely girl, with no friends, no boyfriend, and parents who always fought. But one day Kasai had, had enough of the fighting. She goes down stairs to stop them, but gets knocked out. the next thing she sees is a hospital room with a doctor. Everything is so blurry to her. The doctor tells her the tragic news of why she is there, and how LONG she's been there. When the doctor leaves Kasai is filled with so much anger, when all of a sudden her bed fals into an underground room. where she meets a guy who says he can help her, but she has to choose to trust him and his companions. What will Kasai choose? And what will she do with her new mysterious power?