Like the previous Five Nights at Freddy’s games, players take on the role of a guard working the night shift at a sister location to the original Freddy Fazbear’s Pizzeria. The sister location features the new Funtime animatronics for the Funtime Auditorium shows.
The player must survive five nights, just like in the other games. Throughout each night the guard is faced with some troubles as some of the animatronics begin to come to life, led by Ballora, a new ballerina animatronic.
The night guard is warned about Ballora by another animatronic come to life, Circus Baby. She explains to him how she is possessed and that they oftentimes try to “fix” the animatrons by “scooping” them out in the scooping room. This involves taking out their endoskeleton and placing them in a new unit. However, Circus Baby explains that even after visiting the scooping room they’re still broken.
It’s revealed that Funtime Freddy, Funtime Foxy and Ballora – along with a few others – have been killing people at the Funtime Auditorium. During the fourth night when two repairmen come to fix Ballora, she and Foxy end up killing them and hanging them on the stage where they usually perform.
The night guard is coaxed by Circus Baby to attempt to “fix” her in the repair room. After taking out Circus Baby’s chip, Baby convinces the night guard to head to the scooping room, but he’s waylaid by Ballora who is attempting to kill him. The guard has no way to defend himself since the lights are all out but Baby convinces Ballora that the night guard is there to help them and to let him live.
The guard is then directed through the dark toward the scooping room where Circus baby reveals her grand plan: since the managers keep scooping out the animatronics after people have accidents or die around them, the animatronic puppets decided that they would have to escape but they couldn’t do so in the suits. Circus Baby came up with the plan to convince the night guard to help her, and that she would help him survive in return. However, after the night guard gets to the scooping room Baby uses the scooper to gut the night guard and take over his body.
The game ends by showing the night guard back at home, staring in the mirror. Before the game fades out to the credits, the guard’s eyes light up to reveal that he’s possessed by Circus Baby.
In one of the secret endings, as recorded by RabidRetrospectGames, the night guard can venture into the private room through the Funtime Auditorium instead of going to the scooping room during night five. If done successfully, the guard ends up in the private room that has monitors and security panels to keep the animatornics out.
A separate segment plays indicating that the night guard will be fired the next day for going into the private room, but first he must survive through the night against the animatronics coming to get him, especially the ones who now feel betrayed.
At the end of the shift, the guard returns home and begins watching television. However, after watching his program one of the animatronics from the scooping room follow him home and walks in front of him as the screen fades to black.
Some theories is that Ennard has taken over Baby’s voice after she’s been to the scooping room and attempts to lure the night guard into the scooping room in order to take over his body. It’s explained that the night guard’s eyes reflect Ennard’s eyes at the end when looking in the mirror and not Baby’s eyes.