Norman, Emma, and Ray are the brightest kids at the Grace Field House orphanage. And under the care of the woman they refer to as "Mama," all the kids have enjoyed a comfortable life. Good food, clean clothes and the perfect environment to learn- what more could an orphan ask for? One day, though, Emma and Norman uncover the dark and twisted truth of the outside world they are forbidden from seeing. Soon, they must make haste to plan their escape!
The Grace Field House (GFハウス,Gureisu Fīrudo Hausu?) is symmetrical flat-hexagonal complex used to raise children as livestock for the demons. It is unique, being one of the four known Premium Farms. It is entirely operated by humans known as Mamas, who also double as caretakers for said children.