A ghost known as "Anna dressed in blood," is massive murder who kills people that steps into her house that she was murder. When Cas, who is a young ghost slayer and a group of high school students went into the house, Anna came out and killed whoever was in the house with Cas, but not Cas himself. Later he decides to talk to her rather than to kill her, she told him that he was just lucky and won’t get off easy next time she sees him. This made Cas think that not all ghost are bad. He also builds a feeling towards her.  Would you be a ghost slayer your whole life or would you fall in love with a ghost?