Among Demons and Gods

the main character, Isa Hironori, is a second year high school student in a Japan where the coexistence of science and magic are natural, as are demons. However when he finds out that he is possessed by a powerful demon he finds out that the only way to get rid of it is to make a contract with a stronger demon. therefore forcing him into a world that only the elite of humanity are involved in. (Please feel free to ask me about anything that seems unclear and give me suggestions on the writing style because this is the first time i have ever wrote something for fun like this, i would love any advice you can give me!)