Felicity, a candidate for sainthood, was born with the power of "precognition". One day, she foresees a future in which countless demons will kill people and destroy the country, but no one believes her. Instead, she is falsely accused and sentenced to be executed. She wants to save her country, but she can't. In her despair, the devil appears before her in a terrifying form. He says to her, "Please, help me. I will save you. I will protect you. In exchange, I will feed you." The tale of a girl and a demon, two people who are torn between each other, and their salvation begins here.