Rin isn't the only one who has inherited the blue flames. Kat Okumura, the middle child had a somewhat normal life. Till one day a boy who she hates tries to burn her. One moment later Kat and Rin are surrounded in blue flames. Kat finds out Shiro Fujimoto is not her true father. She is the daughter of Satan! She has to go through all the trouble of escaping demons, lying to her new friends and it really doesn't help when every boy in the school is hitting on her!