I this game you are a guy called Hiro. Even though you live in a fantastic world, you are quite a common guy from a small boring village and your life is quite usual until one day your grandfather that has been dead for 20 years appears before you and tells you that you are chosen to defeat a mighty satanist Lord Pinku Reiga. Pinku Reiga has a summer residence in your village and is performing a ritual to raise the thirteenth son of Devil himself inside this residence. You need to stop him at any cost. What you actually need is a demon slaying sword which can be produced out of three ingredients. You must find these ingredients somewhere in your village and save the Earth from destruction.