In Magical Girl Celesphonia, you are Amane, a normal lady who lives in a large, dangerous town in Japan. You find out one reason for this danger is creatures known as Monstrums are kidnapping people. One night they come for you and try to kill you, but a book you own suddenly starts to talk to you and says you have a chance to become magical and battle these evil creatures. So, now you have powers and prepare to do all you can to stop the Monstrums and save the world.