However, based on standard literary and online databases (as of my current knowledge), no widely known published book, story, or series exists under that exact title.
Any successful Part 1 of an opposite-themed fantasy must accomplish three goals:
Progression and Puzzles: Players often need to solve riddles, find scattered items, or use specific in-game "apps" on their character's phone to unlock new paths. Narrative Style and Community Reception
Fans have organized a yearly “Vigil of the Un-Release” on December 26th, where they share their own opposite-Christmas creations. Some have written FO:CO2 fan scripts; others compose their own Un-songs. Thir has silently archived these on a hidden webpage titled The Hollow Archive, suggesting they may be watching—or gathering material.