Reality Note
Take notes. Reality is about to be rewritten.
Chapter 1
by 
Unknown7
Beyond our world exists a realm of the gods. Each god creates notebooks called Reality Notes to create worlds.
Each Reality Note controls the reality in one world. Sometimes the Reality Note is never used and the world progresses naturally. Other times, the god in charge of the Reality Note makes changes. Some do so responsibly.
Others just write in whatever amuses them. However there is one god who decided to let a mortal use his Reality Note because "humans are so interesting". He went to the reality that his notebook effected and throw the notebook there.
He would then wait for someone to find it.