At Coso's Happy Restaurant, it has two recognizable entertainers. Coso and Cosa. They're both parts of Coso's group. Those animatronics have been bringing fun to human children as they both feel very liked. But at night, Coso and Cosa behave ominous. They move around the restaurant for a weird reason. They seem to be actually evil. Coso and Cosa aren't simply genderswap counterparts, they are actually twin siblings. Because they are humans inside those animatronic humanoids. Coso is possessed by Kevin Monthgor. Cosa is possessed by Violet Monthgor. Kevin and Violet are parts of the Monthgor family, Coso and Cosa's family, and Coso's group. They seem to filled with hatred and anger. They tried to kill their own father, Edward Monthgor. These kids surely don't know killing their dad is a horrible decision to do. But Kevin and Violet wanted to reunite with their dad yet again if they feel free.