Paul, the owner of a small bookshop, received a strange commission: looking for a book that will appear 100 years later. However, when Paul arrived in the future, he could only see the scene of demons driving out humans before his eyes. In front of Paul who was startled, a man was standing with his arms folded. He, a demon, said some unexpected words. “Run a bookstore with me here.” “What…?” Paul with a bewildered look on his face met with the man’s expression of interest…