Shokujin Shokuyuujou

It was late at night when I witnessed it in the park. Kamono, the beautiful girl who is the talk of the school, was eating a person. "You may think I'm lying, but I've gotten his consent", "I don't really want to eat people", said a distressed Kamono. I'm going to help Kamono stop eating people but she's been acting suspicious... Is the beautiful girl a "tragic heroine" or is she a "cannibalistic murderer"?