Definitely not a true story. FNAF is a work of fiction that takes place in a fictional world with its own set of rules and scenarios. It's all about creating a thrilling and immersive gaming and storytelling experience, not reflecting reality.
The FNAF backstory is full of mystery. There are rumors of hauntings, dark events at the pizzeria, and unanswered questions that keep fans guessing. It's a world filled with suspense and horror elements.
One book similar to the FNAF story is 'The Silver Eyes' by Scott Cawthon. It has a similar spooky atmosphere with mysterious events and animatronics that seem to have a life of their own.