In 1984, it's a peaceful time in New York City, and many cars drives by you, going on shopping sprees, etc. Until one day, you get a phone call from an unknown number, saying that you're hired by only 7 nights & getting paid every night. You've thinked about getting a 7 night shift job & you've accepted that job. The unknown number was glad & and hung up.
After the hang-up, it's revealed that it's William Afton who made that call that's looking for the next victim to be killed by the Animatronics, he smiles with an evil grin.