People receive a book when they are born. A play that includes all about their world, meaning of life, and destiny. It's called Book of Fate, which people use to follow the stories narrated by a Storyteller. They portray and act out the roles written in the book from their birth, until their death.

The story follows the adventures of Ex and his friends (whose Books of Fate are completely blank) through various fairy tale worlds in order to defeat the Fortem Cult, a mysterious organization that seeks to free people from whatever pre-written fate the Storytellers had in mind for them.

The game was originally an online game whose service ended in June 17, 2020. This offline version was re-released with its gameplay system removed, but all of its cutscenes were made available to read.

Before playing Grimms Notes, it is recommended to have an episode list in hand so you can follow the story from beginning to end without missing anything, since the majority of chapters are not listed in chronological order. Here is one.