God, Let Me Teach You How to Be a Human Being

I wake up. There are three more 'people' in this world. A [demon] that blatantly eats people. [Nightmare] who happily eats people. A [god] who eats people legally and legally. … "You are all riding horses and you are not a human being. I am here to teach you how to be a human being." Spoilers for this book ahead of time: The love between man and demon is absolute, the plot is rigorous, the IQ is online, and the killing is decisive.