it was 30 years after the primary 3 restaurants; fredbears and spring bonnies pizzeria, Freddy fazbears pizzeria, and circus babys pizza world shut down due to the accidents. they built another one called fazbears fright, and you became a night guard in. you decided to go to your office, it was all greenish.

you'd go watch the cameras and on Cam 10 there was a withered spring bonnie (springtrap) walking to your office.