Book of Subduing Demons

There are monsters, demons, ghosts, and monsters in this world that are causing harm to the world. Follow me with my sword and sword, and kill all the demons! ———————————— One volume of heavenly book, thousands of demons. Page after page, monster after monster. You know where the devil is, and the devil knows where you are. The demon will just stay where it is when it first appears, but if you don't get rid of it, it will come and eat you! And every time you kill a demon, you can get a magical power, a spell. It was not until the end, when all the pages in the Book of Heaven were turned over and the demons were eliminated, that he discovered that the great world had just begun...