Diane is a 18 year old girl.. Her parents died since she was 7. She lived with her uncle. But her uncle always harrassing and abused her. Her uncle blamed her for her sister's dead.. 

Diane also gets bullied on the school because she's so quiet. A lot of people hated her.. 

One day when she was facing the mirror she suddenly saw a weird girl with cat ears.. That girl said that she was a guardian angel. She thought that girl was joking.