Prologue
This Prologue serves to inform the readers that the first 3 chapters are a future setting and set up the premise of the story’s evolution, while giving a slight glimpse into what the main story entails.
Simply, chapter 1 to 3 happens later than the main story and makes you wonder when and what the the main character went through to get to that stage and finally do you think you can solve the mystery of the story before the finale?
Have Fun.