My Roommate Is a Witch

My name is Arakawa Jiji, I am 23 years old. Because I am shy about my wallet, I am sharing a house with a beautiful girl. Under the systematic arrangement, I am working hard to become an outstanding novelist beyond "Xia Shizi", and I work on the manuscript until the early morning every night before resting. I don't take the initiative to cause trouble, and I don't have any secrets on how to eliminate demons. However, there are always some guys who call themselves Reiwa Detective Edogawa and curious exorcist Chitanda who come to me to ask for tips on "subduing witches". I usually drink a glass of scalding milk before going to bed, and then I sleep until dawn. I exercise regularly and am very energetic. Even the witch girl I live with says I'm too normal.